Let's get back on topic before I actually moderate something.
10-4. Like everything else, the coilovers are going to be just the start. Since they contain springs that are relatively soft, you are going to have significant front end roll (exacerbated by the aforementioned assumed roll center location problem) and will need a way to combat the loss of grip this causes. There are two ways, and IMO employing both of them is best.
1) Add bigger sway bars. Without a limited slip (and even with if you aren't careful) the larger front can cause a loss of corner exit traction, but it is a net positive in my experience. The larger rear is a must.
2) Camber. Check my build thread for how I did it on the cheap. On a dual purpose car, how much you run is a big compromise when it comes to wear.
Overall, get out there and have fun. My Focus was 7 months old when it was first on track and the only mods were a 22mm Progress rear bar and a Winnie the Poo window shade for my son's car seat.