I use a tuner, that's it. I usually bypass the amp EQ too. Drive comes from pushing the input gain of the amp and how hard I play the strings thereafter. If your music demands effects, then go for it by all means, but don't have the mindset they're a must-have. I have never used a compressor, live, aside from the gentle clipping of the input gain stage. You need to be in tune (well, most of us do 😉 ). Everything else is fluff you should be able to play without in an emergency (or just fundamentally be able to play without). Nobody really gives two figs about the subtle phasing you apply during the second chorus but, if it makes you happy, yeah alright, go for it, spend that cash.