So easy but i have done it 100's of times! First remove the plastic cowlings and the cabin filter housing if present.Remove the blue R clip and pull up the white return valve from the top of the fuel filter then undo the two jubilee clips from the in and out of the filter and pull the pipes off,these can be quite stuck sometimes and you will need to grip them with blunt pliers to get them moving,once you have the pipes off then pull up the filter and slip the new one in,if the old filter wont lift out then hit it from underneath with something heavyT:
Refit the two pipes onto the new filter and tighten the clips then push home the white return valve and slide the R clip back in. Job done restart the engine and it will probably cut out so just keep trying to restart until it pulls the fuel through,it is self bleeding.
Tip dont continually crank the engine for more than 15 second intervals having a break of at least one minute inbetween cranks as you could overheat the starter motor.
It shouldnt take more than 3-4 attempts to start to fill the filter.