Play the pentatonic blues scale, just for fret- and pick-hand dexterity and to mesh them both together.
I go through about two Fender mediums a night because I don't pick straight down; it's sort of sideways, and it shaves them off.
To get a feel for the right-hand picking technique, you have to let the pick 'fall' from string to string as if you were strumming a chord. It's important that you don't separate the pick strokes.
A lot of other bass players have told me I'm the only bass player who plays with a pick but sounds like he's playing with the thumb and fingers, which is a great compliment.
The easiest place to get a natural harmonic on any string is at the 12th fret. All you do is lightly rest one of your left-hand fingers on a string directly above that fret and then pick it.
To play sweep arpeggios correctly, you have to mute each note with the left hand immediately after picking it.
I would get records by Earl Scruggs... I would tune my banjo down and I'd pick out the songs note by note. Learned how to play that way. I persevered. There was a book written by Pete Seeger, who showed you some basic strumming and some basic picking... And I kind of worked out my own style of playing.
Guitarists use downstrokes and upstrokes to play fast patterns, but doubling up on down- or upstrokes might be essential to the sound of a specific melody. So as a player, you've got to sharpen your picking skills as much as you can.
