I hooked up my dad's printers to his PC, then just added the two as a network prnter on my PC via my wifi connection. Sure, it means I have to switch on his PC if I want to print, but I can live with that (plus, the wall socket is in the next room, so I'm not innundated). And I wouldn't try putting too many power-hungry equiptment on the same wall socket, unless you have one of those snazzy extension power adapters that allow you to switch off each appliance on it.
Just try your test and see. Don't plug in everything at once, and take care not to overload the mains power.