Flying change success!

During today's jump lesson, on approximately our third (but possibly 10th) try, we finally got a right to left flying lead change!!  Without any leaping, just a regular old, "oh, you wanted a change, ok here it is" kind of thing!  John clapped.
We also rode a few lines (a six stride, a five stride to a one stride, and a long four) quite well and forward.  When Charlie took off, I could feel my hips close like they are supposed to, instead of jumping ahead.
It wasn't perfect, but somehow I got him nice and forward and he was eager to jump also.
Then we went on a nice long walk on John's uphill trail to cool off.
Charlie is such a great boy.
The secret to the change was the 3-10 tries before that, the lesson earlier in the week, but most (?) importantly, I took a breath, I'd ask him to bend right, I'd do a half pass right (on a circle), then I'd change his bend to left, lift my right hand, and ask with my legs for the new lead.  I had to do each step and do each one precisely and calmly.
He did a little better too, after we jumped a fence and landed left, he'd remember left and be more likely to land on the left lead (instead of his usual 90% on the right lead no matter what) - but I am also doing a much better job looking, bending a bit a few strides out, but I still need work on my leg aids for the correct lead when we are taking off.
I also walked the lines when we were done, and the 6 walked one step short (4'), the 5 walked perfectly, and the 4 walked one big step long (4'+) so I can now apply that to walking the SJ course at the shows for when I need to ride big into one vs. ride regular vs. ride tight.