I'm having a hard time understanding what lines to cut because of the solid lines crossing over dotted lines in the pattern,i don't understand how it wants me to glue these? Also for those of you that have done sharkman mk6 or any other iron man helmet, what height did you use for the helmet that made it fit right for you? Sorry for the long stream of questions just one more. What do you guys usually cut with? Exacto knife all the time or scissors?