Fixed voltage is mostly for people who run constant speeds and don't want a power saving feature when the computer is idle (most likely used for people who's computers aren't idle even when they aren't there)
It's actually similar, I wouldn't say simpler.
Find stable vcore for desired multiplier
Find proper LLC setting to try to elminate vcore spikes completely and try to elminate most droop.
(example, you don't want a vcore that droops from 1.320 all the way to 1.240, 1.320 to 1.296 would be acceptable but the purpose is to find a LLC level that keeps the cpu voltage under load closest to what its set at)
check out that thread there are a bunch of overclocking guides there so you can get an idea of what and how to do.
wish you the best mate