take the bull by the horns

Take the bull by the horns is what some people say as a way to tell them to confront a problem head-on and deal with the problem openly and honestly. By grabbing a bull by the horns, you are accepting that the current problem could be very tricky (or dangerous) but you know that the quickest way to get it resolved is to just grin and bear it, be courageous, and confront this problem in a way that you can deal with it openly and in an upfront manner.