fast learning

Hey guys I have decided to learn 3BLD. But what is the best tutorial? The JPerm tutorial doesn't make the most sense to me... So yeah where should I learn?

I mean, am I doing it right or I´m too slow at learning? Should i practice more or my pace is ok? Cause right now im really ****ed due i want to be sub 20 and i do 25 sec average with slow cross, intuitive f2l, 6 (basic) algorithms of oll+yellow cross and 10 algs for pll. I used to solve the...