Yeah, the voltages terrify me to be honest, and I always thought I would just leave amps alone in my DIY adventures.
But then over the last year or so I've been talking to a few Electrical Engineers at the Uni and a local amp tech, and they've been really supportive of giving it a crack, and have offered lots of safety advice.
I'd also been doing a lot of reading just out of interest, and realised that while it IS still scary, at least now I can read a schematic and have a much better idea of what all the parts in the amp actually do. When I started soldering a year or two ago I was totally lost in the wild, and a fuzz circuit was totally beyond me. An amp would have killed me for sure.
I've started ordering parts for a 5E3 build, so once it all starts arriving I'll start a build diary here and we will see how it goes!