Further to my thoughts in my previous post, Painting and confidence , on my painting session yesterday, there are two books that I warmly recommend to those who encounter pitfalls on the way to creating art:
Art & Fear by David Bayle and Ted Orland - A shortish book clear and to the point - which, at the very least, allows you to recognize yourself and be reassured that you are not batty, and more, to articulate things you may have experienced in a strikingly simple and direct manner with a spice of humour.
Trust the Process: an Artist's Guide to Letting Go by Shaun McNiff - A little harder to get into but well worth an initial push, once you get going you don't look back.
I re-read passages from time to time from both of these books.