a first attempt, using a careful approach, it should take about 2 hours all together.
you need to:
-remove the 2 bolts holding upper inlet manifold to head
-remove 5 (i think) torx bolts holding upper inlet manifold to lower inlet manifold
-remove the 2 fuel lines from the back left of the upper inlet manifold
-remove the 2 torx bolts holding the bracket for the 2 fuel lines to the upper inlet manifold (back left)
-raise the upper inlet manifold a few inches by wedging something underneath it.
-remove the brakcet at the right hand sinde of the lower inlet manifold. cant remember what its for but theres 2 bolts, one at top one at bottom.
-remove the 3 torx bolts that hold the fuel rail to the head
-pull the fuel rail (hard) so the injectors are clear of the head
-slide the fuel rail to the right so it can be removed, this may require the battery to be reomved for clearnance, and the fuel lines will need to be slid along as well
-remove the fuel injector wiring harness from the fuel rail
-remove the injectors (each one has a metal clip)
now do the reversal and you're all done.
i would suggest you fit all 4 injectors so you have a matching set. keep your old ones as spares.