Just installed my MGW 2 weeks ago with a floor jack - its actually a fairly easy install on the GT, even with it being the older model that you have to install mostly from under the vehicle. Took me half a day or so following the online install video, keep in mind this is the first legit part install I've done on my own outside of changing oil/tires.
If you're interested in working on your own vehicle the tools to do it yourself including a good floor jack would cost about as much as the install quote...and then you have a bunch of new tools for future mods!