Nothng to worry about. Just go slow and steady. hopefully, you have looked at some of the websites on how to do it. I jack it up on stands, pull the front wheels, undo the caliper and hang it, release all the hoses from the strut, unclip the sensor from the brake if you are on that side, allen wrench to remove the abs sensor. Three bolts on bottom of the steering knuckle then the three on top of the strut tower. The strut will pull out now with the disk attached. Compress the spring and take it apart being careful to lay out everything exactly as it comes out. Use a couple pipe wrenches to get the collar nut off and pull the old strut. Insert new strut and replace collar nut (I had to reuse the old collar nuts because the Sachs kit ones did not fit). Put it back together with the new Sachs bump stop. Re install the strut and double check all the nuts and hoses to be sure everything is tight. Use locktight. Clean everything you can as you go. Start early and pace yourself. Do the other side. All finished with front in about 3-4 hours.
Rear, remove seat bottom, couple screws to loosen seat back which pushes up. Pull seat back back toward front seats. There is a cover which is just below the parcel shelf on either side. Remove that and remove the strut nuts. Underneath, there is just the one bolt to remove and it comes right out. Same deal with taking it apart. Good to use new strut bearings in rear....fronts almost never wear out.
Put it back together in about 2 hours. Drink six pack of beer and vow never to do this again!
Good luck. Hard day but worth it. Don't drive the car after the six pack!
Mike Holbrook
Meridian, Idaho
1992 535im, 17", Euro M5 Throwing Stars 8's & 9's, FK-451 235/45s & 255/40s, M5 Sway Bars 25/20, Conforti chip, Lowes Ram Air, glass sunroof