There are loads of tutorials and videos on line, but I found that once I got started I could work it out mostly for myself, but with some specific questions to my guru. (Martine is wonderful and has helped me over every hurdle.)
I really think that is is more important to have a good idea of what you want to do when you begin. A totally blank canvas is far too daunting.
Good luck if you decide to take the plunge.
thank you sue that does make me feel better and I know i will jump that hurdle soon.