Learning to manipulate keyframes within keyframes

I have mostly worked on tutorials this week. The minutia involved in animating expressions and mouth positions can be tedious. But they are also extremely finicky. You have to double click holding down shift, touch your nose and count backwards for it to work sometimes. Last night I tried to do a simple test animation of the zebra having a few facial expressions. I couldn't get it to work. So I finally went to bed. I don't know what I did different tonight, but it worked. Here's my zebra walking and moving some facial features.