I got ya:
1) Yes, you can do it. A few tips...
2) Find a good box. Do some research. The closest one to you isn't necessarily the best. Quality of the box and coaches will have a major impact on your enjoyment AND your safety.
3) Don't be shy about being a noob. You won't be able to move as much weight or move as fast as the experienced crossfitters. That's OK, and actually very important to know your limits. They call it "scaling" the workout. You'll be scaling a lot, so just get used to it.
4) Start slow. Especially on the skill/strength movements, form is everything. The first several months you'll be doing less weight than you're probably capable of. This is both to prevent injury and also to make good form a habit for when you're ready to start moving more weight. It takes repeated tries to understand the physics of it.
5) Don't cherry-pick workouts. Show up. It's a program and all the movements/workouts are tied together with three goals: Better, stronger, faster. Cherry picking limits your progress.
5) Commit to it. Don't give it a trial month and say you can't do it. You have to give it three good months of regular attendance.