Stay in the shallow!
It is difficult for me to give you a timeline for such progress. Some drills people learn faster than others. But to answer your immediate question stay out of the deep end with drills until you swim out of it. You'd impede the other swimmers. Superman Glide, skating drills and all others can be done in the shallow end of the pool. If you only go 15 feet or so...so what. Turn around and go back. When you make a mistake just stop, stand-up and star over. Not so easy to do in the deep if you do not feel you can do a certain drill in that part of the pool. Others would have more advice but just stay in the shallow area for now.