spend about 3 US Dollars and buy some alcohol wipes, wipe down the plane's headsets prior to your use. also wipe down the controls and throttles and anything else you are likely to touch.
we do this at the airlines and we swap planes all the time. personal headsets are allowed of course and we use them, but if you have 700 bucks to spend, think before you spend it.
and buy that book I told you to get.