Well, what can I say. Just do it. I bought my KF when I was about 10hrs into instruction. I pulled the kf out and told my instructor to go fly it, he did. He came back and said, when do you want to start, I said right now. With that I went back and forth between the c172 and the kf because the fella that was going to do the check ride wouldn't do it in the kf. I will say that I also had some good experience with Mark the original owner during my solo work, he flew with me and taught me how to have FUN in a kf. Yup I'm talking Mark Ferkin.
Now for you to let all of us know about you. Your appox. age, your interest, and how forgowing you are. All these are important because the kitfox is pretty responsive. I got to where I hated the c172 because it was such a dog and turning, might as well call it a bus. My problem when starting out was the use of the rudder. I remember my own little exercise of pushing on the floor of my truck with my feet everytime I made a turn. kind of funny when you think about it, but it worked. I ended up soloing in the 172 first and then a week later in the kf.
I will tell you this, if you can master the kf you can fly anything. trust me on that one.