They are kinda a pain without a seal puller, but you're on the right track . The seal body is made of thin metal, coated in a rubbery material, and a rubber inner sealing ring. It also has a spring that runs around the circumference of the inner lip, so don't freak out when you find that. if you can, pry it out with a screwdriver, but screwing a sheet metal screw into the seal a little bit might help too. Just don't damage the bearing behind the seal, or get metal shavings in it. And be careful not to score up the crank shaft, too. I know it's a hassle, but be patient, be careful, and don't give up or get frustrated. You'll get it.