Paintkits, like models come in all shapes and sizes, varying from easy to really complicated. The one for the Twotter is on the complicated side, at least I think so. I say this because it is huge, with a frightening amount of layers, but mainly because of a complicated texture lay-out, which takes away a lot of the fun. Especially if you have a complicated paintscheme, figuring out how to connect all the lines or colors will need a lot of patience and perseverance. I did a few paints for the Twotter, and would have liked to do more, but I paint for fun, and some of my plans were not funny. In fact, some of the ones I did were a nightmare to complete.
Hence my advice: start with a really simple scheme to get started, just to get to grips with the layout and the paintkit...and then progress to more difficult ones.