I have a young family member staying with my family for the next few months. He's not bring his gaming pc. Can I just remove the macos hd from my mac pro and put in a new hd and install only windows? I want him to use my mac pro as a gaming pc. After he leaves I will remove the windows hd and just put back my macos hd in the mac pro. Will everything return back to normal? Can I just install windows using a usb windows install disk without bootcamp?