Fishing line works.
One drop of super glue to hold the star washers in place on the pots. ONE drop. ONE. A small one at that.
Make a template from the guitars layout, using cardboard. Get the spacing EXACT. Assemble the pots on it, do all the hookups and wiring. Take the pots off, get the strings thru the body holes and onto the correct pots.
Some guitars stuff thru the f/hole, in which case you need to get the pickups on, and solder the wires as they stick up thru the f/hole.
Some guitars have a hole in the bridge pickup route. You'll need to get the neck pickup lead sticking up from that hole, solder it in place and then stuff the controls in. Keep in mind, you need to stuff the jack in there too. On a 335, the switch goes in there too.
Gibson uses shrink tubing "unshrunk" to cover the various braided leads so they wont touch things like the switch... or hot leads.
When you got it all mechanically in, do like Gibson, take a wire and wrap up the extra braid and keep it in a safe place (they actually solder the wire to both braids - each pickup cable... keeps the noise down).
And thats that. Its not a total pain in the ass. More like a root canal. :laughing7: