Yes, dissassmbly is required, then so is putting on a kit.
As far as the advantage goes, I think so. In order for your motor to take full advantage of what the kit gives you, port matching is essential. Most of the time kits come with larger transfer ports and you have to match them to your case in order for the gas to travel smoothly without hitting any walls. I don't know about your bike in particular, but this is usually the case (no pun intended).
I think you should for the experience. You may actually enjoy it. Do you have a Dremmel?