normally when i see someone for a phobia I do a quick diagnostic check prior to anything else that involves them focusing on the feeling that lets them know they are anxious (or however they describe it). I know some therapists believe this is a bad thing to do because it makes them access that bad experience or feeling- however I only get them to do it briefly and to totally focus on the feeling as a feeling rather than relive the experience - so it at least has the value of making the feelings more subjective - understanding a feeling is a feeling and examinging it. I then ask them to report anything that pops into their head. I guess I am going for the miracle cure here and occasionaly it happens someone recalls something that was not really that bad which subsequently related to the development of the fear or phobia. Either way I then get them to think of something else that totally removes them from that thought or feeling, something that conjures up happy, relaxed, confident resources that i think will be useful. After focusing on a bad feeling most people seem to be able to find something else very quickly. I then anchor this good feeling.
When doing the fast phobia cure - I get them to imagine a TV and video recorder - float out to an observing position, watch themselves wacting a movie, then for the observing self to get in and out of the movie a few times - I then check in for a rating of how they are feeling. If it has only gone down to a 5 I have often got them to watch it again while simulataneously firing the good anchor and find that 10/10 times this reduces the rating normally to zero.
Dont know if this is technically the correct thing to do - but it seems to work.