Its a waste of money to pay somebody to do work you could do yourself, but if you are going to do anything solo you don't fully understand, then watch a shit load of youtube tutorials so you know what your doing, before you even start. Theres hundreds of DIY audio installs & other useful shit on youtube..... Nobody showed me anything, 4 cars later and i haven't paid anyone jackshit for sub/amp and head unit installs..... DO YOUR RESEARCH......THEN ALL WILL GO WELL
Fuck everyones bitching, just go do some reading & watching then attempt it yourself..... If you fuck up, your regret it but you wont fuck up again ...... If you know what i mean.
Good Luck