Any competent mechanic can do this job. My only concerns would be ensuring that the sport compact shop has:

1) Certified mechanics.
2) Experience doing this.
3) Proper torque information for the car.

Please also note that most major tire shops have certified mechanics that specialize in lowering kits (Belle Tire, etc). They do a nice job, and have all three of the above. Plus, it doesn't hurt that they usually have all of the equipment on site to align the car properly after it is done. The alternative is to do it yourself, and though it is an easy job, I wouldn't recommend it unless you live very close to an alignment shop (so you can go STRAIGHT THERE once the job is done (or risk severe tire wear).

You are really going to enjoy the Prokit. I installed one on my previous car (modified Mazda Protege5), and it was nice. It doesn't spoil the ride one bit (because it is progressive rate), and dials out body roll a good deal (for the same reason). Not only does handling improve, it will give the car a nice stance to boot!