take off upper intake manifold.... using quick disconnect tool disconnect the fuel rail, (or go the ghetto way, releive fuel by using scharader valve, then undo 2 7mm screws).... unbolt fuel rail, remove fuel rail, pull out injectors, reverse process to put new ones in.
remember to repressurize fuel rail when done by putting key in on, then off then on a few times before trying to start, also if going with bigger injectors you should also upgrade the maf to one calibrated for the injectors.
Quickest and cleanest way to relieve fuel pressure is to find the fuel pump fuse and pull it, then try to start the car. The car will turn and turn and turn, but will not start. Do this twice at a max of 5 seconds each time (not good for the starter/battery/alternator). This will relieve all fuel pressure in the rail. Now follow pucks advice ... I find this easier than the schrader valve because fuel in the rail will leak (spray) when pressure if relieved through the schrader valve.
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