I am trying to replace by bathroom faucet and cannot get the old one out. I cant get the brass line to seperate from the more flexible chrome colored tubing. I unscerwed one nut that appeared to be what was holding the two together, but they still won’t pull apart. Has anyone else had this problem? Obviously, I have no clue what I’m doing. Not sure if I need to simply pull harder, or unscrew another nut. Any help would be appreciated.