As a new USPSA member with two special qualifiers under his belt, I would advise to keep the difficult shots. Humiliation is self-imposed. I would tend to view poor performance on difficult targets as an opportunity to identify weak spots and work on them. I know I would not take the time to adjust my fixed sights were it not for the occasional long or precise shot.
New shooters should be encouraged, but I wouldn't design stages around them. If people only want to be good at things that are easy, I suggest Tic-Tac-Toe. Keep the head shots coming!
Once again, total newbie.