On my 04, I have to remove all the plug wires and the rack that holds them.
Then remove the gas cap to relieve some pressure.
Remove the cover over the fuel line monitor valve (on the left side of the rail, it looks like a tire pressure shrader valve) and push in the valve to release any more pressure.
Remove the 4 bolts that hold down the fuel rail. The rail is fragile (if you kink it, its trash) so I would remove the whole thing, not just one side. You may have to remove most if not all of the injector and coil connectors to get enough height on the rail lift. To remove the connectors you have to disengage the lock tab, then press down on the release tab and pull gently.
The injectors are held into the rail by U shaped clips. You need to remove the clip from the bad injector to get the injector out. Watch out, these clips have a tendency to fly around and get lost.
Like said, put a little oil on the rubber o rings of the new injector and re-insert into the rail and replace the clip.
Push the rail/injectors back down into the manifold and make sure you get the injectors fully seated.
Once the rail is back into place, gently bolt it back down.
Re-attach all connectors/plug wires, etc.
