Do I really need to elaborate? In case I do, let me just remind you that you get what you pay for. Cheap usually means more headaches, shoddy quality, and more money in the long run. Spend a little more money up front for quality equipment and better workmanship. In the end, you’ll be glad you did.
If you think I’m just joking when I talk about Murphy’s Law, think again. I’ve been doing projects since I was 5. I’ve done easy ones, I’ve done hard ones. I’ve been in the linear particle accelerator at Stanford University working on projects with doctors and engineers who have fancy degrees and thousands of years’ worth of experience. Here’s the bottom line: Nothing ever goes the way it’s supposed to. Never (unless your goal is to do something stupid; then things tend to work out even better than you planned).
Measure twice, cut once. Then be prepared for anything, and always be patient. Every project involves art and science. The science part is usually obvious, and that’s what attracts most people. The art is in smiling when things go awry.