Info please on running wires to the trunk

My old posting just got bumped somewhere,anyway i'm trying to run my wires to the trunk of my 1995 BMW 318i(4door) and i came across a dead end.I removed the lower part of the rear seat but it appears that i may have to remove the back part as well but don't know how ?,does anybody know how or other ways,i came across a very small passage but i'm worried that they may not fit.Does anyone have a manual on this kinda things or other ideas .Hope this posting will stay long enough till someone will read it

Thanks anyways sparkyssb,i was hoping that someone may have done this and ...you know.

Does anyone perhaps has some kind of manual like how to remove the back part of the rear seat,it should't be this hard,or really how do the PROs do it ?sure they must have had to deal with this sort of problems.

Sorry about re-posting,but it's very frustrating !

Thank you.