I have to agree with those that say "screen, screen, screen." If there are no reviews, post an inquiry here...maybe someone has seen her and give you accurate feedback. But not all feedback is accurate. So, if you decide to see someone absent good research, you really are blowing your wad. You might get lucky w/ a good provider, but mostly, the good providers reps get ahead of them and we all know who they are. You might decide to TOFTT. If so, let us know so we can appreciate your research. But good consistent reviews on any of the boards is the only way to play the odds. In the end, everything we do in the hobby is a risk--from meeting providers to getting caught.

In answer to your quest, I don't think it is good form to back out except in the 1st 5 minutes or so. You make a date, agree to the cost of companionship. You should live up to the agreement.