Oh, it took weeks. I practiced pretty much every chance I got.

[ sitting at home, watching television, piles of broken appliances and scraps spread out on the floor around her while she practiced pulling apart and rebuilding. now, she practices complicated builds, moving pieces, electrical components, but she's always practicing. ]

For me, it wasn't building anything significant, but just practicing taking things apart, putting them together. Yours might be different. It might be about enhancing things, or changing them in some way. We won't know for sure until you can do it on your own.