carri,
I am about 8 months into an exposure program. I think you have to think think about what bothers you the most in order to create a heirarchy that's right for you. Even though it is a close race, sound is definitely at the top of my hierarchy. Here is what my therapist created for me:
1. Still pictures, increasing in intensity (I am at the end stage of this process).
2. Vomit scenes in movies, starting with watching in slow motion (frame by frame on a DVD player), moving up to regular speed, increasing in intensity, sound off.
3. Watching a tape with people really vomitting, sound off.
4. Starting with step 2 and moving to step 3, with sound.
5. Real life experience (yikes!)
happyteacher