Are you trying to pull the injectors out still connected to the lines? It wont happen, the lines will foul the inlet and you wont be able to angle them out. You need to split the lines/injectors first and then you can pull the injectors out the inlet itself.

If the injectors are rotating inside the clams, then the best bet - and its fiddly -
Undo the tiny (8mm) bolts holding the clamps down, pull them up onto the injector so they are as out the way as you can get them
You'll then need 2 spanners, i think a 13mm and a 9/16" (its been a while!), one on the fuel pipe hex that screws onto the injector, the other goes just under it on the injector itself (this is v. difficult to see/angle the spanner onto).

The above probably makes naff all sense, its one of those things that nigh on impossible to explain without being there.