One explanation and advice from my teacher and I was able to finally make progress in building speed within hours than working my a... off practicing slowly for months before.
I feel like I wasted many hours of practice throughout weeks by trying to implement some pieces of advice heard in those tutorials. For instance: never practice for speed, practice for comfort and accuracy. Always practice slowly and perform fast.
I took the opposite approach and threw my hands out there--I learned the motion first and the accuracy followed... it worked for me...and it was FUN, too.
never a word about "how" to acquire general idea flow regardless of idiom, which is the main block for beginners.