BMW: Clutch Replacment, torx sockets, shift linkage

Question
I am the Owner of an 89 Bmw 525i (5 spd Manual Trans)
I have noticed lately that my clutch is gone..and i would like to replace it. If you could help with telling me how difficult is to replace it and what do i need(special tools)
Thank you for your help

Answer
Jusuf,
 Changing a clutch is not that hard, but it is very time consuming.  I have done this plenty of times and it would take me several hours to change one.
 If you are mechanically inclined, you can do it, but you might need a friend to help.  

 First off, you need to order a Clutch kit.  This should have Clutch disc, Pressure plate, Throw-out bearing, and an alignment tool.  Check www.bavauto.com or www.pelicanparts.com, they usually have the best prices around, and high quality parts. (usually $300 for the kit)

 Now that you have the clutch kit, inspect it to make sure nothing is missing, you dont want to pull the tranny out, and find out that you are missing something for the clutch.

 You are going to have to completely remove the transmission from the car, this means dropping the exhaust (in most cases), remove the drive shaft...etc.  I dont remember what the transmission weighs, but it's not light.  I think it's 80lbs or something like that.  This will have to come out, so if you are not up to this, then have a shop help.  

 You need to get all 4 wheels off the ground, preferably with Jack stands for safety.  
 remove the exhaust, driveshaft and all the heat shields.  You will need to remove the slave cylinder from the transmission as well.  It's a small cylinder with a hose running to it.  Remove the two 10mm-12mm nuts holding it on and it slides out.  Disconnect the back-up light switch as well.  Behind the transmission you will see the shift linkage that allows you to change gears.  Remove the clip on one end of the rod to disconnect the shift linkage.  Now you will have to remove the transmission bolts.  They require special sockets that look like a star (called Torx sockets).  The bolts that hold the starter are a real pain, as they have nuts on the back side, and you have to get someone to hold the but with a wrench so you can remove the bolt.  It is VERY tight, and it's best to have at least 2 feet of extensions so you can get the bolts out.  
  Now that you have removed the bolts on the bell housing, you should slide a jack under the car to support the transmission.  It cannot fall until you pull it backward, and pull the input shaft out of the engine. Once you have the jack in place, remove the transmission support.  Once this is loose, pull the tranny off the engine and lower it slowly.

 once the tranny is out, you can see the clutch and pressure plate on the back of the engine.  Remove the 6-8 bolts around the pressure plate and it will pop off.  Now inspect the flywheel closely (what the pressure plate was bolted to) for cracks or warpage.  The flywheel should be smooth and shiny like a brake rotor, with no gouges or discoloration.  If you have experienced "shutter" when the clutch is engaging, then it could be due to a warped flywheel (heat does this).  If you are questionable about the flywheel, remove it and take it to a machine shop to have them resurface it.

 While you have the tranny out, you should drain and refill the tranny fluid.  It's much easier when the tranny is out of the car.
 
 Reinstallation is reverse of removal.  

 If you have anyother questions, dont hesitate to ask!
 Hope this helps,
 Josh