I am guessing it's not a ham, so I would take the skin off and apply rub. Figure on 1.5 hours per pound. Start a little early so you can foil and rest in an empty cooler wrapped in towels for a couple of hours. It makes it easier to pull. I think what you call leg of pork we call pork shoulder, the other half of the joint that includes the butt. It's supposed to have more dark meat than butt. I've cooked one but it's been more than 10 years.