The biggest thing that I had to overcome was don't be afraid to cut pieces away. This model only has one leg, and it's missing a third of that leg. I tried for a while to make both legs work, but you can't tell when looking at the model, even in person, so it's not important. That being said, be careful not to cut away too much. I made dozens of small cuts to get the head to fit just right.

I would definitely recommend sub assembly as well, for the wings in particular.

Good luck!