Oly-lifting practice

I try to go to Scott's Olympic lifting class every Saturday but I don't always make it. Today, though, I started to make some progress on the snatch from the floor. I was using about 20 kg (the women's bar with the two 10-pound plates). When pulling from the floor I had a tendency to leave out the shrug. Finally I started to get it, after practicing the pull and shrug from the hang and then lower and lower. Then we worked on overhead squats. The heaviest I got up to was 30 kg for four reps. I need to keep track of the weights I use in these training sessions in order to have some sense of how and when to progress.