I've been learning the game the last couple years, so, for the past 2-3 seasons, I've been constantly in a swing change. Sometimes more radical changes and sometimes less. I've found that my play tends to be more erratic when making large changes but trends in the right direction overall. I usually play 2-3 (9 or 18 hole) rounds a week even when making big changes. Sometimes I play 9 directly after a practice session (I don't usually score well, but I almost always make few real nice shots).
My problem is that I've always been an over-thinker so swing changes tend to get me thinking too much when I'm on the course. I think Michael Breed offered a good suggestion. Take two practice swings: the first focusing on whatever change you're trying to make, and the second focusing on just making a nice steady swing.
Anyway, I wouldn't worry too much about it and just go play. What's the worst that can happen? A bad round is all. Go out, have fun, and enjoy the course.
PS: plan for the course ahead of time (at least tee-shot clubs/targets) to try to minimize the mental work while playing.