I have ordered a box of 8X10 E100VS so I can cut it down to use with my Canham 5 X7. I have a rotary trimmer that I bought at an office supply store and have be en "practicing" with it. However, I am not getting good "cuts" with it. Should I be using a typical paper cutter with the blade that comes straight down, or d o just need to get a better rotary trimmer. Suggestions and help appreciated fr om those who are cutting down their own film. Thanks. Jim