well, of course you can. just do it as if youre doing it on a harddrive. anyway, to dual boot bt5 on a mac, youd need to partition ur mac manually then reboot, plug ur usb in, press alt. you should see ur usb by then, click on it and install. make sure you install it right btw.
if youre really new, dont try it yet. ill try to get a proper tut up. or maybe sw1tch can help you... but anyway, on a mac, vm is the way to go! hahaha