By drawing and not tracing, you keep training your eyes and improving your skills. Depending on the subject, sometimes a line through the middle and one across is enough to hold on to.
In Photoshop Elements it's easy to display different kinds of gridlines in the preferences window: Photoshop Elements -> Preferences -> Guides & Grid
You can switch the grid on and off from the view menu: View->Grid
To display a grid with a lines through the middle point and quarter points, select Gridline every: 50 percent and Subdivisions: 2





