Hello...
I asked the same question about assembling Muzzy 3-bladers about a year ago. My girlfriend can put them together much better than I can. But now that I have more practice, they are easy to put together once you get the hang of it. I switch back and forth between the cutting blades and the practice blades with easy now. So, if you are having too much trouble, get your girlfriend or wife to help out! It worked for me...
Cheers,
Gary