Take off the right front tyre and the inner fender. Be carful not to pull off the side molding when you do. I used a standard universal puller. To get the bolt off the crank you're going to have to use an impact wrench becasue you won't have the BMW tool that keeps the crank from rotating. Once you get the bolt and belt off (I assume you have the special tool to take tension off the belt) you're going to need some bolts. Use 3 6mmx1.0 pitch bolts about 80mm long to attatch the puller to the old pulley. You're also going to need a bolt 12mmx1.75 pitch (check that once you get the old bolt out) that's about 55mm long. Most cranks have a tappered end with a keyway to line up the pulley. With that type of crank the end is exposed for the center bolt of the puller to use as leverage. BMW uses a crank with a press fit pulley so the end of the crack is covered by the pulley. In order to get something for the center bolt of the puller to rest against you are going to have to use a bolt that is tredded into the crank. This is another special BMW tool that we don't have. Use that 12 mm bolt for that purpose. It's not easy, but you should see steady movement of the old pulley as you tightedn the center bolt of your puller. If you don't, then STOP because you have something lined up wrong. Once you get the old pulley off, heat the new pulley in 350 oven for about 15 min. Once heated, the pulley will slid on the crank. Make sure it goes all the way on then put everything back together. It's really not that bad if you don't hurry and pay attention to where things line up. Let me know if you have any more questions once you read this over.