When I receive Toshirou, the first thing I did was to try to attach the ice part that goes around his shoulders and back. That part kept falling off. It took me a while to get it to stay on. When I finally got it, I would try to attach the arms. Then the ice piece would fall off again. After successfully getting the arms and ice piece in the right place, I tried to attach the wings. The wings weren't easy. I had to apply a bit more force.
In the end, it was worth the effort. I love how cool Toshirou looks. I get real proud of myself and him every time I look at him.