Been a while since anyone added to this so I thought I’d throw in 2 cents..
All previous suggestions demand that you TAKE YOUR TIME. It’s hard, I know. You want it done NOW and you wanna crank it up! Work slowly and methodically – check your wiring as you go (I use the same method as ajswanson but print out my layouts before hand and check each connection off as it’s made). Plan each step, complete it , then force yourself to walk away from it for a while. When you come back you’ll be more focused on what comes next.