Cupid has been pretty consistent about getting the correct canter leads both directions, so we've been working a little more towards training automatic lead changes. We started just organically, as part of our flatwork or while jumping courses we would change direction and while in the turn ask for a lead change - use new inside leg to create bend, and cue with new outside leg behind the girth. No big deal if nothing happens, just do a trot change. (We pretty much always ended up doing the trot change.)
Then last Friday my trainer got on Cupid, and got a lead change out of him! It was right to left, which I thought would be his harder direction. But maybe it helps coming from the more balanced right lead?
One of the jumps was on a diagonal, and I was supposed to ask for the lead change going into the corner. The first several times we ended up doing a trot change, so my trainer decided to put a pole on the ground and we got the change. Overall that whole round felt very good so we decided to end on a good note!