So I've been working on this, and Toby is doing amazingly! Firsts off, I bought a Gold's weighted Exercise ball so it didn't move as much ($18 instead of $9, plus I'll be using it for exercise) and it was totally worth it! I wrap 2 blankets around the base and put my knees on it (He did this in some of the videos). It works perfectly fine, and you don't have to go find some kind of base.
I had a ton of trouble the first night getting him to jump on it, but he started to get what I wanted. I ended that session and started again the next day. This day we had trouble getting him to stay on it. I wasn't going to start doing Top and Rebound until I had Stall down. He didn't understand what I wanted, and would jump on and immediately off. I tried to catch him, but that just made him jump off he far end. I wanted to end before I got frustrated, so I ended this session.
Then one of my friends was over so we tried putting her on the other side. He loved this (2 sources of treats!) and we had much more success. This way he jumped in the middle, and one of us would be able to catch him, then while one of us was holding him, the other would give him treats while on the ball. We started using less and less of a hold. Today she came over again, and we got to where neither of us had to hold on to him. Then she gradually backed away. Then we started working on our commands. He is doing Stalls and Tops so well now. I don't think he has differentiated between them quite yet, but he is doing very well! We're having trouble with Rebound, but this isn't a big priority to me. I'll be working on this by itself from now on, because I think he was getting confused.
But thank you so much for the link! It has been awesome!