Okay, you'll need standard cutting disks. You can get the fibreglass reinforced ones but regular will do fine. They are a round deep brown or black disk with a small hole in the middle. I would also recommend a small cone or cylinder shaped grinding stone. It will be about the size of a pen tip. This is good for the fine corner areas on the visor.
Here's some basic tips - don't cut anywhere near your legs. Use a work bench or table. The spining cut off discs can skip on you and you don't want a dremmel induced trench down your legs. Depending on the plastic your gaints are made from, cutting it may vreate some powerful fumes. The dremmel burns through plastic (literally) and the fumes can be dangerous. Work outside if possible.
A flex shaft will be helpful but you can do without it. If you want one, go to home depot and ask the tool area guy. It's basically a long black "snake" that attaches to your dremmel's head and ends with a head which can hold bits, discs, etc.
Remember, if in doubt, ask! The Home Depot pays those guys to answer your questions. Just explain what you are cutting and with what. If they don't help you, try another home reno place 'cause that one sucks.
Hope this helps.
