I'm still transcribing "Paganini: Caprice No. 5", though, I'm just over 1/2 of the way through. I realized, since I last mentioned working on it, that I needed to work on my endurance to even keep up with this piece, so I've been drilling it into memory after about every 64 notes I transcribe... which, for a two and a half to three minute piece(depending on if using the repeat, which the handful of violinists I've listened to don't bother to perform) written almost entirely in 1/16 notes(outside the intro and out being written in 1/32 notes), has taken me awhile to learn/train up to speed. At least now I'm physically able to keep up with it, and am learning to read standard notation while sourcing good fingerings on the fretboard much faster... so hopefully the second half takes me less time to put under my fingers.
The other obstacle has been finding the proper amp settings to make the sound flow in a violin like manner in combination with my technique while eliminating as much unnecessary sustain as possible, and keeping up technical stability while playing for so fast for so long... Without disciplined stability, the piece just starts sounding unbearably doggy until it simply drags out into bad/confusing noise.