Having access to a thickness planer makes this activity much easier and more precise. I was able with relative ease to plane the whole length of both the apron and stem down to the specified thickness on my own. I did spend some time fretting about keeping the angles square and not ending up with a weird parallelogram that would give the bow a weird twist. fortunately the thickness planer coupled with a square and some judicious hand planing kept everything progressing smoothly. When planing the apron down to the right 2″ thickness i was sure to keep checking that it was square.