Hi Dolf!
Yes, you can pick something beforehand.
That being said, though, when I first started using the feelings exercise, I really notice the difference it could make when I worked on something that was present front and center and had a real "zing" to it. The benefit of using it as things are surfacing is that the feelings don't get a chance to land and get their hooks into you.
All the best!
Wendy Greer
