Poor Gib is still very frightened, which prompted an explosive situation when I mounted. He doesn't buck or rear - he just tries to spin and run away - far away, as fast as he can. Poor guy. Bending his neck to one side and holding him with the outside leg works, but then he stands there and trembles. Once you get going, he's tentative, but okay. Today, most of what we did was get on and off , on and walk in a tight circle, get off and on....and hand walk all around the property.
It's going to take a lot of trust building until he doesn't panic when a rider mounts, the poor boy. Probably have to back up a few steps and do a lot of ground work - they seemed to have skipped a lot when he was young.