Easy, unbolt fuel rail with two short 10mm bolts, careful as fuel pressure will still be present, use a rag over rail as you pull it off the injectors, but pressure soon goes.
Make sure to unplug the injectors first though, and slide off the clips, lift fuel rail, remove injectors from rail or inlet, which ever one they stick in, then use a bit of light oil on the seals of the new injectors, after checking them carefully for splits/worn sections, and refit in reverse order.
Check VERY carefully for leaks around the rail/injectors before driving off.
tabetha
ps I assume you have the fitting kit that goes on the top of the injectors, otherwise they won't fit anyway.