fune and easy
This is a very easy and satisfying job. Takes about 1.5 hrs. Plan on replacing the rubber breathers to the injectors I would also replace the main breathers that feed them too. The rubber at your cars age will be brittle. I would also recommend having something to blow out the area, compressed air works very well. Also buy the plastic injector holders they come with green seals. I would also buy new injector seals too, with out the injectors probably about $4 an injector for both parts. I also replaced my injectors but need to as two where questionable.
p.s. No special tools although using a pipe wrench makes it easier than standard wrenches.
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)