Re: Frustrated because of tension when trying to pick really fast
For me, what has helped a lot in this area is playing a piece way the **** slower than I think that I can.
I used to learn a piece, then use a metronome and increase speed until it was impossible to play any faster and I was making mistakes/super tense . . . then kept trying to play the piece like this and eventually get frustrated that I couldn't do it.
Now I learn to play the piece at like half the speed or less. I make sure that my hands are completely relaxed and that it's coming out perfect every single time before increasing the metronome at all. If tension comes back in, even if I'm landing all the notes, I back it off a bit and keep practicing.
When you do things the first way, you learn to be tense while playing fast . . . and it's really, really hard to unlearn. When you do it the second way it takes a little longer to get up to speed . . . but eventually you can play faster and more fluidly.
YMMV, but that's what works for me.