Wonder if transmission issues are related to the clutch release slave/master cylinder? Perhaps it simply needs to have air bled from the system. Certainly can make it hard/impossible to shift until you stomp it a few times since the clutch would fully disengage given enough air in the lines. I've had it happen to me before. Unless he installed the wrong transmission fluid. I suppose that could cause some drag/coupling until things warm up.
Good luck. I'd try a dealership. Sometimes the prices for service can be quite reasonable and they usually get it right or make it right.
