One way to simplify playing complex passages is to focus on where your hand position needs to be on the neck, rather than focusing on the fingers. This approach should be 2nd nature to upright players and classical guitar players. I started doing this when playing Bach, but it is very useful for guitar and sax solos as well as that bass line for "Hysteria" You do need to invest some upfront time analyzing the score to find the best positions for a given measure. The results may change the way you play bass. Use pencil, as you will probably see better fingering approaches as you get more experienced. Here is a mark up of the first measures of Charlie Christian' s solo on "Solo Flight". Charlie preferred solos that soundef like horns,rather than guitar, so his note choices and fingering were very different . than the norm. The roman numeral refers to the position i.e. location of the index finger. Good luck.