Baneful Drummer thank you! My best tip is to transition fast and get inverted as quick as possible to push up

I believe 2 exercises which played the major part for me getting that transition part unlocked were basically just practicing that tuck planche/planche lean and handstand a lot. I did exersice other calisthenics moves also, but after more regular training of those three I suddenly just did that transition (and almost fell down just of sheer surprise). But like said, it needs a lot practise to build that base strength. But then you don't need even to be fast. ;)