Looking for some specific technique pointers, I guess.
I'm trying to use bench chisels to cut them which works ok, I'm using a mortis gauge and marking knife to layout the holes first. I carefully start at one end, making a shallow cut and work my way across the length of the mortis cutting deeper until I get to the far end. I don't trim or clean the walls as I work but I tend to have pretty "fuzzy" holes and the final product isn't consistently wide. I'm using the width of my chisel to set the width of the mortis. Does this just boil down to practice or are there little tricks to make it go faster and more accurately?