I’m with Paul and Mike…I’ve found if I focus on the measurement too much, I always end up off. I measure to make my initial marks and set my stop, fence, whatever, then cut. From there, I use the cut piece to mark the joining piece. If I have to make a duplicate of a part after the initial setup, I use the other piece to re-set my stops / fence. It’s not so much being precise as it is being consistent. If you make one component precisely to the plans, but every other part is a 16th off, it ends up looking like the precise part is mis-cut.