Started with a blank canvas in Photoshop and just sketched out some basic positions of where I thought the ball should bounce.
I'd been reading Richard Williams' Animator's Survival Kit for a while before doing this, but I soon realized that reading and doing are... oh so different. I sort of overwhelmed myself at first, trying to remember every single word I'd read when doing this, instead of taking small steps. After the initial sketch I filled in each of the frames on a separate layer and did several tests to see how the movement flowed. It's a mess to be quite honest, but I understand that I'm going to be making messes for a while until I've gone through a larger volume of learning, trial, and error. I think the main things for next time will be to have a more organized workflow, and to really plan out the variation of timing between key frames.