I only have one complete build under my belt (and a few still in the works) but my typical rules are:
Measure twice, cut once.
Never take your eye off the blade.
Don't do any work if you feel you're in a hurry.
There's also great ways to save money when you're ordering parts, sometimes it's cheaper to order parts at higher prices together to save on shipping than buying piece by piece for cheaper on ebay and then have to pay for shipping.
I like the adjustable tuning keys from stewmac and buying my bridge and all electronics from guitarelectronics.com
Measure twice, cut once.
Never take your eye off the blade.
Don't do any work if you feel you're in a hurry.
There's also great ways to save money when you're ordering parts, sometimes it's cheaper to order parts at higher prices together to save on shipping than buying piece by piece for cheaper on ebay and then have to pay for shipping.
I like the adjustable tuning keys from stewmac and buying my bridge and all electronics from guitarelectronics.com