Bart,
It is well worth learning. Trapping gives you a whole new experience when sailing. Instead of repeating what many others have written, I would suggest looking at the Hobie support pages. This is the last place I remember seeing instructions on how to trap.
Yes, most of us use adjustable trap mechanisms to make getting in and out and adjusting your height while on teh wire. If you look though this forum I believe you will see a thread or two about this.
If the harness is adjusted properly trapping can be comfortable for the better part of the day.