Have you ever installed any bicycle brakes before? It's not rocket science but you can find ways to screw up the install. Either do some reading and count on having to fix a mistake or two when doing it yourself, or take it somewhere to have them installed.

I am aware that many road bikes come with two sets of brake levers. As I stated earlier, the difference is that those bikes either use road calipers or canitlevers which are long pull brakes. Your v-brakes are linear pull brakes (hence why they require special road-style levers like the RL520) and as far as I know, no cyclocross interupter levers will work with those brakes. You will either need a travel agent to correct the pull of long pull levers or switch to cantilever brakes (a direct bolt-on in place of your v-brakes).

Note that all of this discussion is moot if your current levers are integrated into your shifters (unless you happen to have the Shimano shifters/brakes that are capable of long or linear pull). If they are integrated, you're stuck not only buying new brake levers but also new shifter pods and the accompanying install (no problems doing it but it's starting to get pricey).