#1
i switched over from playing bass to playing guitar, i played for a good 4 years, anyways
my left hand is a lot faster and a lot more...talented? i guess i don't know the word

anyways i'm having trouble with alternate picking and such, i'm very slow and inaccurate when switching strings, can someone give me some good exercises to do
#2

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Try doing that, start off slow. Then speed it up, making sure you don't hit any strings your not supposed to do.
Also learn some scales and do the same thing, start off slow and try to get faster