I hear it's really easy from everyone. But, even though I do OMT often in residency, I'm still pretty nervous about the practical. I always got nervous about practicals in med school.
It sounds to me like they let you do what you want, i.e. if you are treating someone for lumbar pain you can just do MFR/ST, psoas ME, lumbar ME (so long as it takes up 4 minutes). You don't have to do HVLA if you don't want to (or at least set it up). Or if you have someone with cervical pain and you don't do cervical counterstrain, they aren't going to say, "You have to do counterstrain" so long as you do other applicable techniques.
Any other advice?