Seems alot but then again I've always done mine, it's not hard at all, if I was in your shoes I'd have a go first if that fails then get in the professionals.
All you need is
Power from battery
Phonos and remote from stereo
Earth - find a decent spot in the boot. I always remove a bolt. Sand it to. Are metal then reattach the bolt
It's honestly easy. Will non of ya mates help?