Cut my teeth on the Roland manuals of the 90's
Luxury, luxury, my first Roland manual was the D110 - After about 2 years I even began to understand how to set the RPC's and the NRPC's in midi and sysex.
The best way to master an effects unit is to treat it like you would a musical instrument practice practice practice - ie play with it a lot read the manual at least three times find support groups on the net, set yourself objectives like how can I get an infinite sustain. Guitarists I jammed with said that my GT-6 pedal had the best tones they had heard and a couple of them went and bought the same unit but were disappointed when it didn't sound like mine - I had clocked up a few hundred hours experimenting to get my sounds.