First, attach the door hinges to the door in the appropriate places and then trace the outside of the hinge on the door. Then, remove the hinges. Second, score the door within the traced area. You can do this a number of ways, but I chose to use an Xacto knife to score the traced edge of the hinge and then randomly within the trace. Then, screw the hinges to the door and ensure the hinges and the screw heads are flush. If you are using hinges with removable pins, you can take the hinge apart and just attach one side to the door. In this case, attach the other side of the hinge to the door frame, and proceed to the next step. Firstly, cut a length of batten as long as the hinge recess. Use a hammer and chisel to split the wood to the approximate depth needed – slightly deeper, rather than not deep enough, is best.

We are going slightly out of order here... here is our experience in door jamb mortise cutting.
To cut the mortises you will need a few things:

Cutting Hinge Slots In Door Frame Sizes

A Hammer
A Chisel the same width as your hinge
Remember... measure twice, cut once. Oh, yes... and measure again... and throw something at the wall because your hinges moved on you after you cut the mortise. That MUST be it.
First, score the edges of your mortise:
Then, chisel lines across the mortise using a chisel the same width as the mortise. Make the lines about 1/8 inch apart.
Finally, take the chisel, bevel side down, and gently tap up through your lines. They should come up quite easily.

Cutting Hinge Slots In Door Frames

As you can see from the picture, this was NOT what we tried first... we don't recommend simply whacking at the jamb with the hammer and chisel. (The chip at the top of the mortise is from THAT method.) The method we depicted DOES work, however, and gives you nice flat and smooth mortises.

Cutting Hinge Slots In Door Frame Lock

Cutting Hinge Slots In Door Frame Doors

Next.... UTTER FAILURE in door hanging. Stay tuned.