| It is not hard one bit...The tranny should be warm. To do the job you need:
-jack
-Sta Lube pump <---can get at any auto store for $3.00
-Empty windshield washer container
-3/8 drive socket wrench
-2 quarts ATF tranny fluid- I used redline D4 ATF
1. Jack car up and secure it.
2. Remove fill bolt on tranny then remove drain bolt.
3. Let the fluid drain completely and tighten the drain bolt.
4. Fill the windsheild washer container with the new fluid and screw on the Sta Lube pump.
5. Put the hose from the pump into the fill bolt opening and pump the fluid in.
6. The tranny need 1.2 quarts so I pump approx that amount -THEN- lower the car off the jack (so it's even-on a flat surface) and keep pumping until the fluid spills out the fill opening.
7. Jack car back up and remove the lube pump.
8. Tighten the fill bolt.
Thats it..lower car and start her up. I let it idle a few minutes, while working the shifter, then drive her carefully until im convinced the new oil is worked in.
And a little tip- I was used to hondas where the tranny is in the front by the axle. On the bimmer the tranny is right in the middle of the car..Dont undo the motor oil drain pan instead by accident- which is located in the front.. | 
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