As mentioned above, tapping on the bass is really simple compared to playing the piano.
My first piano recital I completely froze up and forgot where I was in the Bach Invention I was playing. My piano teacher actually started singing the next part to me from the audience...
Beyond embarassment.
There's alot of talk up here about tapping. In addition to the independence stuff, also try working on some of the Sheehan/ Wimbish/ Van Halen derived stuff. Less demanding for the independence stuff, and it really impresses guitarists.
When I got my first lesson with Wooten in the early 90's, he gave me an exercise that took years to master. If you really wanna tap, try playing unison major scales, starting with lh middle finger on 8th fret E string, rh middle on 15th fret A string. Unison 4 finger C major scales. Then try in harmony. Then offset the rh an 8th note. Etc...
Oh yeah when you get frustrated, why not work on some meat and potatos bass? I still know very few guys who can play Jamerson's line on What's Goin On from memory.
