I do what Firebird does if it is a big job. Otherwise I just turn it on, go clean the sponge for cleaning off and put some water on it, and the thing usually is about ready to go. I have two exceptions...
My Mary Kaye strat, the leads to the jack were an odd length and it was easier to just put a european style term block in there for the hot and ground instead of unscrewing the jack plate. Also I was worried about the holes that the screws for the jack plate went into getting worn. The other is a guitar that I have been swapping pickups in and out of and recording samples for a project to get as best a consensus of the recorded sound of all of the pick ups. They have been some interesting things that Troubled Treble made for me and I wanted to see, keeping the amp, guitar and mic placement the same, how much they sounded different. I have that guitar's setup wire nutted to make things swappable very fast. I'll solder it when I settle on what I think does the best job.
Also, flux doesn't seem to bother me much anymore. I guess the desire for the guitar or pedal or amp out weighs the annoying smell.
Patrick