My instructor is GREAT! I am still learning the complicated stuff with keeping the horse straight, making real circles (instead of lopsided circles), etc. I find that there is about 1,000% more stuff that goes on in lessons than I can actually take in at one time, so I try to focus on one or two things she tells me...and then I work on that stuff when I'm cooling the horse off or warming it up.
One thing my trainer does is that she periodically makes a video, and e-mails it to me. That REALLY brings some of this stuff home! I mean, I hear her tell me 1,000 times to do something-or-other, but when I watch the video and see what I've done right before she tells me this thing (again!) I get SO much of a better understanding of what I need to change!
The lessons really keep me focused. (These are private lessons, by the way. For one, I think I'm the only adult novice rider at this barn, for two, I really want that directed feedback. Really, I do not get away with ANYTHING.)