First day of BJJ

Since i started doing muay thai i loved watching everyone doing bjj. I wouldve started doing it earlier but my knee couldnt handle the akward movements. So now that i think my kick boxing classes are...well pretty much a joke i decided i needed a new challenge. I have a feeling im gonna hav a hard time remember all the steps to each move. on the first day i learned pummeling, two takedowns(double leg, and some other one that i can't remember the name of), triangle, and triangle to an armbar, and breaking guard plus all the terminology inbetween. Then after an hour and twenty minutes i got to do live rolling with one of the guys. he was going way easy on me but it was still fun. and if it wasn't for his kung fu grip i wouldve got the armbar. and best of all my knee hasnt felt this pain free in a long time.