I also understand what you are saying...If you play for a church right now, you are under a lot of pressure to perform NOW not tommorrow. Peoples expectations can cause you to have to rush and try to learn everything overnight.
You hit on something right here, let me address this. I don't care how much pressure people put on you, it's up to you if u give in to it or not. When I was first learning, my church was coming to me wit all kinds of requests to sing songs, but I turned them all down because I was still learning the basics. They got mad at me, but I didn't care cuz I wanted to do it the right way.
Your church ain't gonna die because u can't play all the new stuff yet. Just play what u can right now, then later on when u get more experience, u can revisit it. I liken this to "trying to keep up wit the Jones'", u gonna wear yourself out trying to rush and learn, and u still gonna end up going right back to da basics. So, why not start with the basics and save yourself the trouble of coming back to it later?
Again, this is my opinion coming from my experience. U can take it or leave it, just want to share that wit my LGM family.