I just did the job on a 1990 535im. I've done done a few clutch jobs in my life and IMHO this job was the biggest PITA I've run accross. MAke sure you have time.
Here's a few links of advice I was given, and info about my experience in general.
http://www.bimmernut.com/wwwboard/e...ages/56336.html
http://www.bimmernut.com/wwwboard/e...ages/54438.html
http://www.bimmernut.com/wwwboard/e...ages/52797.html
Good time to consider a different shifter.
http://www.bimmernut.com/wwwboard/e...ages/56125.html
I also replaced two of the transmission seals and the rear engine seal, and the plastic pin the clutch fork sits on.
A few more threads with advice given to me off the old board:
http://www.bimmernut.com/wwwboard/e...ages/52637.html
Here's the first thread, when I asked the same question you did:
http://www.bimmernut.com/wwwboard/e...ages/52551.html
Here's a link to a previously posed Clutch replacement question:
http://www.bimmer.info/forum/showthr...=4485#poststop