Step 3: Score the ham!
If you're using an uncooked ham, set it on one side. If you're using a cooked ham, set it cut side down on a cutting board.
Take a large knife and make shallow cuts, from 1/4 inch to 1/2 inch deep. It isn't very important where you make these - my mom just does it every couple inches. And only worry about the top of the ham - you don't need to score the bottom side of the ham.
The first three photos show how it should look at the end - the rest are showing how my mom scores it. She cautions that you will need to hold the skin and fat into place - sometimes it likes to slip off during cutting.
Our ham ended up being scored a little deep, but that's okay. Just makes it a little trickier to keep the fat on. :P