On the last three jobs I had before I retired, there were always a few coworkers who knew I was gay and it was never an issue. I'll tell you exactly how I came out to one coworker in about 1995.
Mira had told me that I seemed to be a very reasonable man so she wondered why I wasn't married. That time, I just passed it off without saying very much. A few weeks later, I was working on a Saturday so as not to fall behind on getting the state income tax software updated on time. Mira was working on Saturday also, for the same reason, and we were the only two in the office. When she again asked the question, I decided that it was time to level with her, so I said something like the following:
"Well, Mira, it's like this. Most people are romantically attracted mainly to the opposite sex. However, some of us find that our romantic interest is limited to the same sex and therefore marriage would not be appropriate."
She didn't seem to have a problem with it. Later she invited me to have lunch with her, which was probably her way of saying that it's OK. Just by coincidence, a non-gay friend of mine, who knew I was gay, was working for the same company.
I've had experience with coming out at other companies and there has never been a problem. However, I have never run around announcing it to everyone; I never found a need to. And, when coming out, it should not be done in a way to make it seem to be an issue nor should it be done in a confrontational way. Others should not be put into a position of feeling that they have to respond. Ideally, one should come out in normal conversation and being gay should be treated as a mundane matter that is not controversial.
Depending on company culture, men may talk about wives or girl friends; woman may talk about husbands or boy friends. If you feel pressured to do so, you can say something like, "My life isn't very interesting right now," and say nothing more about it. But, don't make up stories about boy friends since doing so is deceptive and could make things more difficult at a later date. People will wonder why you don't talk about girl friends; let them wonder until you feel ready to come out.
It would not be a good idea to come out until you have been working for a company for long enough to establish a reputation as a good worker.