If you're talking about a Haynes manual, there isn't one. Not enough sold to justify them putting one into print.
You might find some manuals available on Ebay for a small price, but not sure what models they are for or whether you are really getting a proper workshop manual.
from memory you need to unbolt from inside the tailgate.
first remove the bottom Grey/black section of trim there are 2 trim fixings surrounding the lock catch, and a screw inside the handle. the trim will then just pull off. the easiest way is to slide your fingers in by the wiper motor and pull outwards. then you need to remove the lighter part surrounding the top of the tailgate. this is simply a case of gently pulling it .