1) While I'm not too familiar with the exact details, you can simply disable your ethernet card from within the Windows control panel. No network card = no network.
2) Not a pain to print at all. You have two options - The first is the install your printer drivers in windows, and print as usual. Works fine. The second is to have Virtual PC emulate a printer, and send all print jobs to the mac driver to be printed. Both work, although I find the first option works much better.