There is really no easy way to install it. You have to be good at soldering so you dont create a short and cold solder joint and shrinktube is what you will want to use to cover the exposed wires.
The apexi instructions are about as good as you can get for installing that. If your not comfortable installing it then I definately suggest that you find someone with more electronics experience to help you out and/or install it for you.
If your in Toronto you should see if neex has any free time to help you out. Maybe drop him some extra cash for helping you out with it. I am pretty sure that he can install one, or at least point you in the direction of someone that can.