Top goes too.. Trust me.. it's 2 bills worth the spending.. They'll have the windshield off with out a mess and have the new one on in like 30 minutes and u can go back to driving the car normal in 3 hours and full cure in 24 hours..
If you don't have expirence in doing it yourself I wouldn't recommend it
Btw, u don't need anyone to push it down.. just a guy on each side to move it into position and then set it down.. it's really easy.. that is if you are a pro.. the install guy had a cordless power caulk gun.. etc etc.. Just put your foot in your pocket n get it done right the first time.. u'll probably end up spending more money trying to do it yourself and more time/frustration! Learn from me on that piece of advice.