i am practicing back in black- the song and am working on the first fill which starts as G,E,D,B,A-bend,G. i have been working on it for a long time, and i either get it too slow or too fast. picking is the problem- i have noticed. i pick with the pick a little diagonal, and when i do the up stroke on the 1st string, i either mess up on playing the second string or i hit it by accident, and well, i do not play it right. can somebody help please?