Get a good wood chisel. You can get a whole set for about $25. 1/4 inch up to 1 inch. Trace your hinge, and then first, tap the chisel straight in(the bevel edge to the inside so the cut is sharp/crisp--don't go much deeper than the thickness of the hinge) then, gently tap into the meat of the wood(bevel edge down so you can regulated depth--so you don't cut in too deep). If ya do it right, with a new chisel, you'll get a nice clean flat area for your hinge.
Take your time and you can't go wrong...
I'll give that a try. I figure I'll save about $30/door. The Dremel is okay and I learned to score the outline of the hinge plate with a knife as to try not to over-cut but it still happened and puttyed up the over cuts. Once the paint was on you couldn't tell otherwise. But even with the depth attachment it still needed extra passes to get it just right