Ditto on what the others have said, except that I rarely use a mask when cutting off the parts with the dremel. (by the way, Dremel no longer sells their excellent little saws. I have to use Giros, which are at least five times thicker.) I do my cutting/grinding outside. There's usually enough of a breeze to blow the dust out far enough for my neighbors to enjoy the smell of a brand new resin model as well. If there's no breeze, then I use the mask. The dust can be so fine it'll circulate throughout your house no matter what you do, so I keep it outside.
One of the biggest problems I have with resin, which is about all I do these days, is sanding the parts square. I have several grits of wet/dry paper spray mounted to pieces of acrylic. I wet sand all of my parts on that, The surface is large enough that if I draw the part along in one direction, I can get a nice squared edge. For smaller parts I use a cirular motion to prevent the corners from rounding. The wet method also minimizes dust. I just keep washing the slurry down the drain.
One other thing I do when necessary or practical is to pin parts together with brass pins. Even after washing the parts, the bond between reson parts and CA is not as strong as I'd like. I don't use two part epoxy simply beause it seems more mafan. (First Cantonese word I ever learned, from my mother in law)