It's not to tough. It's the easiest if you pull the front plastics and tank. Drain the coolant. Pull the hoses and take the head off. Put the new head on by following the instructions that come with the new head. You'll need a torque wrench, some screw drivers and some metric sockets.
I do have a question though. How does a 16yr old afford to put a head on a banshee. I was saving for a car, insurance and paying for gas, girlfriend, and oh.. a kid.. lol.