Is this the tutorial you were talking about? The one in the archives?
KS Helmet (ABS), Tutorial on how to assemble it from kit form!
I think it's the same tutorial that the kit will link to, but it was detailed enough for me to make my helmet.
Just make sure to pay attention to the curve on the visor where it meets the dome, back piece where it meets the dome, and be careful with the lens and ear holes. I had a nasty xacto knife slip on the right of the lens, and there's a little random gouge to the right of the lens now.
Don't worry about making too many mistakes, I have had too many slips of the knife and file so that "putting your sweat and blood into it" became quite literal. Measuring twice, cutting once, test fit, repeat worked very well for me. I started trimming the dome first, to get used to how the knife interacts with the ABS, and because it will later get covered up by the faceplate and back of the helmet.
I like your idea of having reference pictures printed out, I think I should have done the same when trimming; I would not have been stuck inside trimming and having plastic shavings fall into the keyboard, I say go print your pics! and take pictures of your own and share them on here!
Good luck and have fun!!