I'm a lifelong Episcopalian who serves on the vestry of my parish and also does work for the diocesan level. I also have done religious education for seekers who are interested in the church.
There are some key differences between the Episcopal Church and the Roman Catholic Church that you should be aware of.
The Roman Catholic Church tends to take clear stands on everything from the nature of the bread and wine in the Eucharist (aka transubstantiation), to birth control, to the death penalty, to what constitutes "just war", to divorce and remarriage and many other issues. Some of these positions are considered either "infallible" or aren't really open to discussion; dissent can mean denial of the sacrament. The Episcopal Church has more of a minimalist theology for very long historical reasons (which I can get into another time). The only time you're expected to make a first-person statement of faith is when you are "Received" which is when you'll recite a form of the Apostle's Creed
. Otherwise you're almost on your own. While you'll recite "We believe..." during the Mass you're not going to be micromanaged and told what YOU must think as an individual. Some people find these kind of freedom refreshing, others find it uncomfortable. You'll have to decide how you feel, but pretty much any responsible position you take on the issues, you'll find a few Episcopalians who agree with you. You may find "touchy feely" churches, but then you may not. It's best to ask around. Most dioceses have "high" or ritualistic churches, "low" or evangelical churches, a conservative (anti-gay) church or two, a left wing activist church, and many middle of the road churches. Again, compared to the RCC, there is a lot of diversity in style and church culture.
While many areas of doctrine are spelt out in the Roman Catholic Church, the Episcopal Church tends to regard much of the Christian faith as mysteries and trust that you will discern God's truth yourself, and paradoxically, it may be different and even contradictory to what the person in the pew next to you believes. We are comfortable with a greater degree of messiness and diversity. You'll find right-wing evangelicals in the same diocese with near-unitarians. They may not like each other, but they stay in communion. This can be distressing for some in that we always seem to be in a state of near crisis over the differences, we air our dirty laundry in public (so it's hard to cover up abuses and scandals) and always seem about to split. But even after Gene Robinson, the openly gay bishop of New Hampshire was elected and mayhem ensued, only about 5% of Episcopalians actually left the church. (The media made it seem like far more, but that's it when the dust settled.)
The Roman Catholic Church believes they are the "One True Church". All other denominations, including the Eastern Orthodox, are considered flawed and will only be perfected by submitting to the Pope. The Episcopal Church believes that we are one of many "One True churches" (or, for some, religions). We tend to believe that no human institution will ever have the whole truth, and that the magnificence of God and mysteries of the universe cannot be contained by the human mind. We believe we have something valuable to offer to the Christian tapestry, but tend to believe that others do too. We maintain very close relationships with the (ELCA) Lutherans, "Old" (non-Papal) Catholics, Methodists, Moravians and others and exchange clergy with these other groups. They are equal to us. We embrace their differences and work together.
The structure of the Episcopal Church is somewhat different than the RCC in that it is far more lay driven. All Episcopal parishes have a vestry of several people elected by the parish for a fixed term. While in the Catholic Church a priest is called by the bishop, in the Episcopal Church the vestry calls a priest and also has the power to dismiss him/her. On the diocesan level, the similar group called the Standing Committee acts as a counterweight against a bishop and can take the bishop to ecclesiastical trial and have them dismissed if they believe a bishop is acting improperly. The lay-driven Commission on Ministry approves who can go to seminary to become a priest, and laity elect their Bishops who must interview for the position and then hold an open forum where anyone can walk in and ask questions. We have a General Convention every three years where about 12,000 laity, clergy and bishops come together to pass resolutions and elect officers. It works like a parliament where clergy and laity form one "house", the bishops the other, and a resolution has to pass both in order to be adopted. Major moral decisions like the acceptance of women priests and homosexuality were made through a series of General Conventions. So authority in the Episcopal Church ultimately flows from the bottom (laity) up, rather than from the top (like a Pope) down. We, in the pews, elect our bishops, choose who can train become priests and choose who is appointed to be priest at our particular parish. The Episcopal Church is definitely not a "pray, pay and obey" kind of church.
Anglican theology tends to be very pragmatic. We live in a flawed world and sin is inevitable. Instead of rapping people over the head for making bad choices, we try to navigate through life doing as little harm as we can and doing as much as we can to help others. You'll generally find most Episcopalians to be rather tolerant and forgiving of others' foibles and we have our fair share of eccentrics. As long as they aren't hurting other people we tend to let people work out their Christian walk as best they can. Excommunication from the Episcopal Church is extremely rare and generally only done if someone is harassing someone else or disrupting the parish community.
Finally you'll find Episcopal worship to be very familiar. It's a bit like pre-Vatican II Catholic worship - more traditional, more chant, classical music and even prayers in Elizabethan English. When the Roman Catholic Church translated their mass into English they used the Episcopal book of worship, called the Book of Common Prayer, as a resource, so some of the prayers are almost identical. You'll feel right at home.
I hope this helps.