Do your research is the main thing, read everything you can find. The better informed you are the better. Plenty of experience on this forum and the internet in general. Like others have said gather as much of the needed parts as you can before hand. Any and all parts you can acquire without digging into your budget money effectively increases the budget. Also, think about starting a build thread. Everyone likes to see what others are doing, anyone can have a good/great idea that others might be able to use.