Keep the same size of speakers for now. Any upgrade to a good known brand will be better than the stuff most automakers dump in there anyway.
As for installers, they will be different all over. There are some terrible installers at places you would expect more from. If you would like somebody to do it for you, ask to take a tour of their install bay. They'll give you crap that they can't and are legally bound and all that. Its crap. Tell them if they are going to work on your car, you want to get an idea of their work. Be cool, they'll be cool. If they blow you off, take your hard earned cash somewhere else!
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