Personally Id just add it to your network already, depending on how much the other pc`s are used and what the person using them is doing. It also depends on how fast your net connection is, if its 4mb+ then it`ll be fine.
And if you mean on a laptop if its integrated don't try to remove it

just disable it in network connections and buy a USB adaptor or PCMCIA those slots on your laptop where cards can go.
If your upgrading a network adaptor in a pc its not too bad: uninstall wireless adaptor drivers, turn pc off and unplug it, take side of case off, remove the wireless card , put new card in , install drivers.