Is it just me?
Just go ahead and build it your way> Stop second guessing yourself and have faith brotha! And I find that task management by isolation is very important,ie; pick a small prject like the k frame and front suspension,make a firm informed decision and then plan how to do it. It will also help if you keep a build "log" by writing down everything you do. It will help keep things clear for final assembly as well by letting you know what got done and what didnt. Remember to bad and tag as you go, ziplocks and a sharpie are indispensable,as well as boxes.
And be realistic,set a budget and build within it. Budget will include labour,so if you can do the work yourself the $$ go a lot further.
I hope this helps. Motivation wise Im pretty terrible myself,but Fabo does help,with either a hug or a kick in the azz to get me going!