Drive by

Hi everybody!
I'm new to the forums...
I mostly registered here because i have a problem.
I drive a dark blue 98' S8 tiptronic , and i'm very pleased with the car.It has all the options , including GPS navigation , but at the time i purchased my car Navi plus with TV wasn't avaliable , but now i have the whole Naviplus unit , and i want to install it in my car. It needs some work , and i'd like any advice before i screw the entire interior up... I already demounted the old radio unit , but don't know how to demount tha A/C unit... Also if you did such conversion , or know someone who did , or a company which does such things... ANY help i will apreaciate... By the way i'm located in Europe so companies here would be better then in the US , but again i'll apreaciate any help , and NO , i won't give up , i'm really hyped with having the big screen TV/Navi unit so don't bother telling me that it's nonsensical , and i already have the unit... THanks