You should just do it! You'll find it was one of the best decisions you'll ever make. I always tell people that, if sick, I would have have still dragged myself to the botanical garden every Tuesday afternoon. I learned so much about what I was doing wrong, and how to correct it. I still refer to my MG notebook (and so do my neighbors).
I would still be volunteering, but after a while, those of us who did a lot sort of burned out and moved on. I hope you'll try it. It's an amazing program for anyone who likes to garden...."successfully."