I don't own a router but this cool attachment takes it's place!!
Further INFO:
In this video I will show you how to cut your bored interior slab door so that it can accept hinge plates without a hammer and chisel and without a router. In fact, you probably have half the main tool you need already! Cutting each hinge mortise took me about 3 or 4 minutes.
NOTE: You could use clamps and some scrap lumbar (1x2 for example) to clamp on the door and use as a makeshift JIG if you were worried about free handing the dremel. But if you go slow and pay attention it is not difficult. Practicing on any piece of scrap wood could be helpful.
A couple of notes:
1. Setting the depth of the cutting tool: It isn't clear in the video but you will gauge your depth using the old door and pressing the cutting bit against the cut out section of the door where the old hinge rested. If you are not using an old door just set the depth using conventional hinge installation measurements.
2. Once you have your door ready to accept the hinge plates, drill pilot holes before you screw the hinges in place.
3. One trick I have learned when mounting the door is to leave the hinges just a tiny bit loose. I mean just a fraction. This will allow the hinges on the door to move just a tiny bit when lining the door hinges up with the mating hinge on the door facing. Once you have the hinge pins in place, torque down the screws on the door's hinges.
4. I used Dremel's 115 Carving Bit. This will run you another $4 or $5.
5. The plunge router kit for the dremel can be used for any light duty style router work you may need to do from making a bookshelf to making your own moulding.
I hope you have found the video helpful!
And for all the old schoolers out there who swear by the hammer and chisel, good on you!