I took a 8-week quilting class that my dealer offered. We started with basic SID (and believe me, I learned a lot of tricks there even if I have been doing it for years) to FMQ, to Bobbin-work and thread-play, to full-on FMQ and ended with Quilt-as-you-go. OMG I still need more practice, but I am no longer afraid.
What I like about this class in particular is that we worked on basic pieces of light muslin NOT on a top. By not having to produce a quilt, we could focus on the TECHNIQUE!
We used the book "Machine Quilting Made Easy" by Maureen Noble. There are lots of activities (exercises) to do and they may seem odd but boy, are they helpful.