One of the problems that plagues many golfers is the way they handle poor shots.  Hit a couple of hooks and the rest of the day is spent trying to figure out what went wrong and how to "fix" it.  The problem is that for every bad shot there could be many possible errors.  It is like looking at a tree and picking out the one leaf that caused the problem this time.  If you are lucky you may find the right leaf but try to correct the wrong problem and you can make it worse.
A better method is to go back to basics and just do it right.  Concentrate on the proper setup and try to execute the swing properly.   Take an attitude that it doesn't matter what went wrong just do the next one correctly.  This will give you a positive frame of mind and will lead to more sucess.