Practice makes perfect, but don't practice on your model. Practice on some scrap wood first until you feel comfortable with carving the v-shaped rabbet in the scrap wood. A bit of practice on something that won't matter if it's screwed up, is worth the time spent. It's an easy skill to master.I am in your debt, as I am to everyone who contributed to this discussion. I think I'm ready to get on with it. Not without a little trepidation, but ready nonetheless!