Learn to use Google Sketchup and make a detailed blueprint of the build before you start. I probably spend more time in the design process, than anything else. I'll have a step by step procedure written down and the project completely built in my head before I spend $1. Do practice runs before the real the thing also. That's with sawing wood, drilling holes, applying silicone, cutting and installing glass, using a router, painting, fiberglassing, making concrete, ect... Going through the motions helps a lot. Think "Wax on, wax off. Wax on, wax off. ... Very good, Daniel-san." I always have blueprint in front of me and a "To Do" list when I'm building something.