He didn't seem very grumpy to me, and you can use power tools at your own peril
The gunsmith manual I have recommends routers for in-letting
So much depends on experience, you have with the power tools. I inlet-ted my first lock with a large router, close to the lock plate outline. Whats nice, is you can get a flat bed depth you want much faster. I just got a couple dremels as well. If you do screw up, hopefully it will be a learning experience
Can you imagine if they had electricity in the 18th century?