All of my plans to date are hand written in various note pads. Some of them complete others not. One day when I find a perfect design that I really like I may put it into auto cad or something, but till then I'll deal with it. The biggest part of it all is having a design on paper of some sort. Double checking all your board size calculations before starting to cut stuff. Remember that board dimensions are not always true! (16" laminated MFD board shelving is not 16" wide, it is 15 1/2" wide! ) Measure and lay out everything before you cut at least twice. Cut everything out and be ready for something not to go as planned. Adapt and overcome!