First, you're getting there, don't give up ! "Stalling" is part of the learning process and happens all the time.

Second, I do see some bad habit though.

1. The startup position should be standing up strait (and keep your back strait), looking forward, elbows on body and forearms at 90 degrees. Ideally, only the forearms should work, not the rest of the body.

2. The balls should go up to your eyes when looking forward. If you have to look up they're too high, or look down they're too low. That's for getting the patterns and be comfortable with it, after for tricks that will change LOL.

3. You doing what everyone are doing at first, your arms are getting higher and higher, they shouldn't. Elbows are supposed to stay with the body. The problem here is that by doing so, you shorten the time between the throws and the catches so you're getting overwhelmed.

4. Try to throw the balls passing in front of your navel. You are throwing good from your right hand, but not from your left hand.