When I did the coilovers for the first time on my first E60, I followed this DIY:
http://5series.net/forums/diy-do-you...install-85378/
The MAJOR caveat I would add: If you have sports or M Sport package with ARS, disconnect the sway bar end links. Since you have to move the front suspension quite a bit to get the struts out without damaging your fenders if you have ARS and it's under tension the sway bar end links will be stressed and pop out after everything is put back together.