The jump back kick is one of the easier kicks to break with in my opinion as you get a tremendous amount of power if your timing on the spin is right.
I would recommend you practice against a heavy bag to get the right motion and with a piece of chalk, mark out a target.
Suspended/speed breaks have always been harder for me. Especially when you are kicking. It is not so tough to break with a knife hand or a ridge hand, but kicking in general is not as fast.
For all spin kicks, I recommend torquing your head around quickly-the body tends to move faster. Getting the "crack" of the hook is the next hard part, but if you can spin quickly, you'll do fine.
Good luck! Is this for a test or a demo?
Miles