I have once downloaded parts of a workshopmanual, I had to change one of the indicators too (snow + lamppost = broken indicator). It is a little bit tricky, I think you have to remove the grille as well.
The manual was on a 205 GTi website somewhere, can't find it in my bookmarks anymore unfortunately, sorry for that. You can always get a Haynes workshopmanual (second hand on Amazon for example). They cost about GBP
12.50 new, well worth the money i.m.h.o.
Good luck, Bas