ok the simple way of saying this is "you should be the person asking questions, put them on a range pre
so there is a raise from UTG, and a raise from the button 2 different hands, same opponent, his range in theory should adjust, if he is raising from the button you can flat call later, but is he going to slow down if you call his flop cb
what hand are you holding, do you think your ahead, do you think he will or can fold
if your hand is a draw, is he giving you the correct odds
if hes giving you the correct odds then the most profitable way is to call it, because if he re raises again then your in trouble.
now as for CBing yourself, look at your opponents, what are they calling you with, are they the type of opponent that floats any 2 cards to see what you do on the turn, what is your table image like.... what kind of board is it wet or dry etc etc