I haven't finished my second yet, but if the cheap neck sounds crappy then you'll think you're improving on the next one. Don't worry about the first one turning out bad, because you're going to want to build another one undoubtedly, and building a guitar will significantly improve your skills, so you won't be wasting this first one. Don't stress too much over parts and stuff like that, just get the first one done and you'll have passed a significant hurdle.