Help with disassemble of head unit!!! Please!

[ReoUKAudi]

Hey guys, I'm kind of a newbie with taking apart Audi's, i have just bought a MMI 3G Plus head unit to replace my old 4G Low res rubbish piece of crap, its came a couple of days ago and i have some free times on my hands to i thought why not go about replacing it my self, but i don't know at all what to do?! i need to guidance please? anyone that can shed some light on my problem? What tools do i need? is there any guide? has anyone ever done this before? some steps? anything please? I've looked all over and cant find anything at all. Nothing. I heard some of some special keys that may be needed? Does anyone know where i can get these? please i am new to this thread but i have been a reader of Audizine for some time now, sorry if im posting in the wrong area, if so could someone please move it.
Thanks in advanced [wrench] [headbang][o_o]

[Dr Chill]

http://www.ebay.co.uk/sch/i.html?_trksid=p5197.m570.l1313.TR7.TRC0&_nkw=audi+radio+key&_sacat=0&_from=R40

[ReoUKAudi]

Great! thanks i got them, any idea where they go? [wrench] be just sticking them in, in hope of hearing a click of some sort :P

[Dr Chill]

They go into slots about 3 cm below the eject and open buttons. I believe the teeth are pointing out.

[ReoUKAudi]

Thanks!, i got it out, but no luck, the sockets for the 3G plus unit are not the same, my cables that are in my A7 do not fit in :( i was thinking is this because of my low res screen [confused] i have a HD one on the way.. are there any cables that are directly connected to the screen?, can anyone tell me where i can buy the cables? any website? any advice [:)] Thanks!