yeah you just lift the back seat ( i removed it using 8mm allen key to give me more space) then there are 3 cross head screws undo them and there is the fuel pump! carefully remove the quick fit pipes and electrical connector (might be useful to mark which one is which, they are marked with arrows on the pump) unscrew the big plastic nut that keeps the pump in place. this might be really tight so persevere. keep an old towel handy as when you remove the pump it will be covered in petrol and you don't want it to spill in your car! chuck out the old and in with the new, just be really careful refitting the new pump especially when it comes ot fitting the pipes back on as if you have fitted a used pump the petrol sends the connectors brittle and liable to snap, just be careful and you'll be fine.
let us know how you get on, and any probs just post on here.
Josh