ummm....how much are you wanting to spend? because paying to have someone install your stuff right is going to cost you because it's going to take a fair deal of time.
Why don't you just install it yourself? what are you wanting to do? custom mold it in or just throw it in the trunk and hook it up to your factory radio?
and btw - tweeter is just about right on (down here) as far as labor costs go....par with any other shop that I might actually trust to touch my car....I won't trust any shop with my own vehicle though, I'd rather do it myself, know how it actually goes it and know how to trouble shoot it so I don't have to pay someone to do that too....
I say try it yourself, it's not hard.