its a very simple job about one hour start to finish,were the seatbelt goes into the door post (b post)at the top the plastic cover has to come off from top to bottom that surrounds it, also the plastic cover that covers the door tred/sill off also,these plastic parts may have a couple of screws holding them in, look for deep holes with screws in , if no holes usualy they are just clipped in, so be carefull taking them out they CAN break, once you have the plastic covers off its only a couple of bolts to take the belt and retainers off,anybody with a bit of DIY nohow should be able to do this job,hope this helps, good luck.
michael k
March 2012