Its essential this is done on a level surface ie a 4 post ramp is best. Warm the car about 10-20 mins, Open the bonnet, raise the car, remove the plastic floor, loosen the fill plug first to make sure you can remove it, then remove the gearbox sump bolt, leave the fluid to drain, refill till oil comes out the side fill hole, this is why its essential to be flat and then refit the parts in reverse order.. The floor uses torx head bolts i think T25. The trasnmission uses one of two bolts from memory mine 6speed 2004 used the newer security spline bit which is specific to the job and i had to get mine through snapon. Otherwise i think it is a hex key or square key which are readily available.
Adam