One of the aspects that has only been briefly discussed:

The follower must follow! If they feel that they need "just a couple more turns" in the thermal and the leader has headed ou, They will be left behind in a hurry.

I have usually asked the "follower" to lead out and then I can trail or move abeam to discuss the next option(s).

I also have a plan discussed with the follower about the general direction of the task legs and what the bail-out procedure is. If the day is long enough you can do a short course and bring them back to the field for them to try is on their own.

MB