I would not hesitate to install it. So long as the bar is reasonable, i.e. less than 24mm, even your most silly driver should be able to handle it. If you're still on the stock struts, they will probably prove to be your ultimate weak point, as they are good, but too slow for the H&R springs if you ask me. I would start off in the medium position for the bar (middle hole) and move it up to maximum (hole closest to the actual body or center of the bar) when you feel more comfortable. A sway bar combined with strut bar boxes the suspension quite nicely in our cars. It took ridiculous, tire destroying camber and funky toe settings to get my car to really oversteer on 8kgf front and 6kgf rear coil-overs. You'll be fine and should noticed a marked improvement in your car's "pointiness" or ability to rotate while cornering. A rear bar will really help the tail follow the nose of the car.

Suspension is actually my favorite part of the car, because I can do the work myself. Of course, that's how I got the stupid alignment settings mentioned previously, so take that for what it's worth.