Agree, you need the high speed saw to cut carbon, those guys using a pipe cutter were more than likely cutting aluminum arrows which is fine. With the carbon you will have the splinters and a great risk to you. The money it cost you to have them cut correctly is far cheaper than the doctor bill it'll cost to remove the splinters from your hand/arm.
Also, using any type of hand tool (ie. Drimmel) will not give a good square end for your insert and broadhead. It might cut clean enough but you can not hold the tool in the same position everytime by hand and will have very inconsistant arrows.
I have my own arrow saw, and know alot of folks can't get their own but I wold recommend to you going and having them cut at a local shop. Especially for safety's sake on your end, and accuracy sake on the bow end.