Lots of good advice here.
I built my first Warmoth guitar last year, and the video series presented here on YouTube was instrumental to my success...
https://www.youtube.com/watch?v=mqLfllURlo8
This was my first build and I had zero experience. My soldering looks like crap, but it's hidden inside the guitar and everything works flawlessly. Using the instructions and tips in these videos, everything else on my build came out superb and I now have a completely personalized Stratocaster that has exactly the components that I want, exactly the look that I want and feels and plays exactly how I want it to. I wouldn't trade it for anything. The only professional help that I enlisted was a local luthier to do a fret level (something I would probably recommend on any new Warmoth neck). I did my own setup as well.
The person who created these videos is obviously a pro luthier and is incredibly meticulous. The series is more than 40 videos long, but depending on the level that you're taking your build, you can skip over many of them. He goes deep into installing a nut from scratch, extensive fretwork, etc.
Just as a quick reference for a couple of simple things...
This is the video where he installs the screws for the tuners: https://www.youtube.com/watch?v=JLN4kV9uB-Q
And here is where he lays out the strap buttons: https://www.youtube.com/watch?v=G935HoZhCmo
Like I said, the videos can be a little lengthy and tedious, but the stuff you'll learn will be worth the time invested.
A couple tips of my own gleaned from my experience and things learned in the videos...
* In the video, the guy talks about using a small countersink bit to put a very light countersink on the holes you drill. Highly recommended.
* Get yourself a good dial caliper. Be sure to measure the diameter of all of your screws and use that measurement to select the proper drill bit before you start drilling on anything. Once you create a hole that's too big for your screw, you have some frustrating work to do. Experience talking here.
* Be sure to measure the depth your screws will go into the wood. And be sure to take this measurement with the screw seated into whatever it is going to hold (i.e., put a pick guard screw in the pick guard and then measure the distance the screw extends beyond the underside of the pick guard). Wrap a small piece of masking tape around your drill bit at the measured length and use that as a stop guide. Seems like an obvious thing to do, but again speaking from experience here. Learn from my mistakes.
* Get yourself a bar of hand soap and press and roll the threads of your screws into it as a lubricant before drilling them home. This is especially useful for larger screws such as your bridge screws or your strap button screws. The screws don't need to be caked with soap, but just have some residue on them. Makes drilling much easier.
* TAKE YOUR TIME!
Have fun with your build, and congrats.