After replacing Front left wheel bearing at 72,000 kms .now with just 75,000 kms, I had to replace the outer cv boot.
About 1 hour job and didnt have to resort to any of my dealer special tools,but did use OE boot kit
*Removed wheel,
*unbolted the lower control arm
*removed wheel hub nut,
*tapped shaft out of hub,
*Pushed the wheel hub/suspension to the front of the car and held it by
securing it with a cable ,thus giving me room to remove CV joint and replace boot.
*Some of you may be reluctant to do this ,but it really is very easy.Put a vice grip on the shaft, tilts the cv joint down and hammer the outside edge of the CV joint away from the middle of the shaft and the c-clip will release with relative ease.
*Cut out torn cv boot ,check, clean,insert small clamp to shaft, then CV boot,then big clamp.
*Replace C clip on shaft with new one and push in Cv joint to shaft
*Fill Cv joint with grease (black ),put the cv boot in its
position,groove etc.Tighten the small inside clamp,tightly with my dealer supplied pincers.(yes,pincers!
*IMPORTANT!before you tighten the big clamp,insert a small screwdriver and
release vacuum from CV boot (failure to do this may shorten life of boot )
*Release hub/suspension from cable ,so its loose again and insert shaft into
hub.Shaft will go in nicely but never enough for you to tighten the nut,so
you need tp hold on shaft on the vice grip and tap evenly on the disc/rotor
to pull the shaft out suficiently to have a few threads for you thread the nut.
When you are confident ,you can thread the nut on the shaft ,DO NOT use
impact wrench YET!Do it manually until you pushed most of the shaft out
*Now you can use the impact wrench and tighten it fully (about 250-300Nms).Dont know why BMW recommend 420Nms when all the ones we have removed here,were removed at less than 300Nms!!!
*Tighten the lower control arm but not fully ,fit wheel ,lower vehicle ,tighten wheel to 100-120 Nms and then tighten control arm bolt fully.

Only advantage I had ,was using the lift at work ,but all the can be done on the ground with a car jack ,only awkward is doing the lower control arm bolt