So I started going to Gokor's Hayastan last week and i love it. However, I'm a fresh newbie and a lot of the class is geared towards advanced stuff. But one of my friends who I know there recommended that I read "Brazilian Jiu-jitsu: Theory and Technique" by Renzo and Royler Gracie to catch up on the basics. I got the book, and it seems really good. But my question is, will it interfere with the technique I'm learning from Gokor? Everyday, I'm drilling the stuff he's teaching in class, but is it okay if I also drill the stuff I learn from the Gracie book? Is it all related?