Training by myself, need a expert opinion.?

first off i was a blue belt in aiki jiujitsu before the school closed down cause we didn't have enough students. I caught on pretty fast, and im a pretty smart kid so i figured that if i got a jiujitsu book and figured out how to do the moves myself that id be ok. I've had success in the past with watching videos and trying moves out in cl. Recently I bought a book on bjj black belt techniques and I was looking though it and some of it looked hard but the majority of it was simple for me. so what im currently doing is figuring the moves out in my head, running though them by myself, then practice them with one of my friends. What i need from you all is some opinions, advice and whatever else you can offer just no rude comments please and thank you.