I did it!! it was not so hard.
but i had a problem with the main wings they are too little in my opinion.
Just fold the cp and collapse it in side (lets say the fold are done and the paper is in front of you when you collapse it, make sure the other side, behind is becoming the outside).
Just collapse the pc inside and not outside

, after you do that shape the wings and etc...
I hope i helped
btw i couldn't photo the process because my mom took the camera and she wasn't at home, sorry....
Good Luck!