A very good book I have by Tage Frid said that he also usually cut his dovetails by hand unless he had quite a few to do. He said there was no time saved on a job with just a few.Chris Becksvoort makes it look so easy!
Chris Becksvoort, the dovetail master at work - FineWoodworking
I noticed he utilized a hefty (4"x21??) belt sander to trim the work. I remember when such sanders were a staple in shops and always reminded me of the 1930's/art deco steam locomotives.