I'm still in the very early stages of learning animation. It's funny but correcting something in one part of the animation may cause new errors either before that part or later, even in a very short animation. Sigh! Well, I'm learning how to make some corrections: For example, check each new bit. If there's an error, correct it. Then, recheck the entire work. If correcting the error has caused new errors, DELETE the new bit. Is my thinking OK? Is there a better way to handle this?

It's hard (or maybe impossible) to delete frames in the middle of an animation. Only at the end does it seem that I can delete frames. Is this true? Or, have I missed something?