My experience (in England) with anything that has JRT in it is:
You don't need to do much to get them finding/chasing rabbits, just show them some rabbit sent and reward them.
The hard part is to get them to stop or slow down so the hawk has a chance. Not an issue with Mini-Ds as they are slower than a rabbit. A JRT (or mix) is very fast.
I don't know if training collars have the intended effect on JRT (or mix).