It is an interference engine, but, if you rotate the engine to line up the marks BEFORE removing the belt, you'll be just fine.
The crank pulley is two piece, the outer piece is held by either 4 or 5 bolts and can be removed separately, for example if you were just changing the timing belt, you would only remove the outer piece to get the timing cover off. Even though you're changing the seal, I would take it off as two pieces, it'll make it easier to see what you're doing.
The crank bolt is held in place with loctite, it's going to be a pain in the butt to release, heat helps - you can pull the old seal out by carefully driving a couple of sheet metal screws into it and then yanking them with a pair of pliers - make yourself some sort of shield to guide the seal into place over the edge of the crank, thin plastic sheet from a sheet protector (think stationery - three ring binder here) should do the trick.