The first guitar I ever wired was a simple strat clone. The second one had two P-Rails. It had neck/both/humbucker switching on a tele-style blade switch, one volume and one tone, push-pulls that switched between single coil/P-90/series humbucker/parallel humbucker mode, a six position varitone that alternated capacitors and effects, a variable treble bleed on a hidden micro-potentiometer, and a kill switch.
When I plugged it in and it didn't work, you can only imagine my frustration. I'd wired it according to what I thought was a good diagram, and it was, except that one of my switches didn't work the way the diagram said it should. I pulled the whole thing apart and started over. I used test leads.
First I played around connecting pickup wires directly to the jack and holding a tuning fork over the pickup until I understood how that all worked. Then I sat down and took a hard look at the switch to see how the connections worked. I tested my theories, and realized that you should never, ever buy one of those ridonkulous tele switches that StewMac passes off as a decent guitar part. (I like StewMac...just not that particular item.) Then I started experimenting with the push-pull pots until I understood how they worked. I tried random lug connections, just to see what would happen. I did the same with all my components, and each one was easier than the last.
By the time I was done, I didn't need a diagram anymore. I'm no expert on this, and there are a lot of guys here who know much more than I do about guitar electronics. My point is that for those of us that don't have a background in electronics, there's a learning curve. I used to hate wiring, but that was just because it was all voodoo to me. There was a point when I really did want to just throw my guitar in the river to see if it would sink. Stick with it and you'll get past that point. Ask questions. And if you do happen to have on of those pitiful tele switches from StewMac, film yourself smashing it with a hammer and send it to their customer service department.
This is the one, curse the day it was made!
http://www.stewmac.com/shop/Electronics,_pickups/Components:_Switches_and_knobs/Lever-action_Pickup_Switch.html