I can hack them out right now and I normally exercise some of her other horses for her. Once it snows and gets gross out though I'll be limited to arenas. I do quite a bit of stirrupless work but normally don't do much posting so I'll add that in there.
She has me do exercises where for example (with stirrups) I'll sit two, rise three. Or sit three rise two. Things like that which tend to help me relax my joints more. (I used to grip with my thigh a lot and I'm working on relaxing that). So I'lll add them in.
I think I understand what you're saying about finding your distances. I'll give it a go. Poncho (the pony Im riding) jumps directly from the base of the jump regardless which is something I'm used to so he'd actually probably be a good horse for me to practice on (so I don't start anticipating). Thanks!
Sitting the trot stirrup-less is easier than sitting with stirrups. That doesn't help. That's why I said sit trot with, post without. :)
I hope my explanation made sense... it really is something you have to practice. Explaining is hard, for me. Lol
Oh and another thing you can do to help you release better. First off, I like what MyBoyPuck said for that horse. That will strengthen your two point also. Don't be afraid to reack up and grab some mane to help you balance. Better to do that than balance on the horses mouth.