I use a very sharp “lineman’s knife” for cutting 703-705, after spending a long time with a serrated kitchen knife. (Less dust)
When cutting many panels:
Covering my wrists with baby powder before cutting seems to reduce the itch that will always find it’s way into latex gloves, tyvek suites, and other duct-tape mummy outfits I’ve tried. (Clogs a few pores in advance of glass fibers finding their way in.)
Also, rubbing your arms with a dry bar of soap immediately after the job can pull a few of the itchy glass fibers out of your skin before you have a chance to work them in with some well-deserved scratching.