Fallout: New Vegas retrieve platinum chip?

You probably need a companion like Boone or Arcade, and a second one Rex or Eyebot. Kill the guards that took your things from you so you can get the key from them and unlock the locker besides them for your weapons. You're gonna need a lot of stimpaks too. If you're gonna wipe out Mr.House, just kill the Legion at the base first then go in the weather station kill all the generators in each room.