I did not do any visualisation with my ASTs. I did them while I was driving to and from work everyday. It is of course better to visualise yourself, but I would like you to concentrate more on the quantity of AST sessions. The more you do, the better.
Sometimes, I would visualise myself speaking fluently in front of a room of people. This always made me feel a little more pressure than when I normally did my ASTs, and it definitely challenged me more.
Let us know how your mind training is going and watch the new Crutch mastery series that has just been released. See you at the SAM meeting on Saturday!