If you are good at following directions, it shouldn't be all that hard to put together. It can take anywhere from a night to a month depending on how you work on it. The bad part comes when you try to fly it. Takes from 3 to 5 seconds to totally destroy it if you are not carefull. Those little helis look cool, but they are not as stable to fly as the bigger ones and flying indoors there are so many things to hit that your chances of it lasting very long are slim. Make sure you have a large empty room to test it in, and get it on tape for the rest of us to see. They look fun, but they are very brittle to be light enough to fly. I wouldn't suggest them for a trainer.