Give it a try, you won't regret
You'll be able to teach yourself something useful for the future (and money-saving!)
For pots, if the standard size is too big, get the 3/8" "minis" (from stewmac or other supplier).
Any decent quality wire will do.
Once you've decided on the wiring diagram, post it here, we'll check if it is ok (internet is full of junk). Jazz Bass wiring is a good start, just do not forget you don't have the metal control plate, used as common ground on many JBs.