Put the GPS away for now... Like said before, try to master the skill of pure VFR navigation (dead reckoning) and when you can navigate anywhere, anytime with it, proceed to radio navigation. Much more useful then following the magenta line for the next 100 hours...
Totally agree with the above. The ability to hold a map on your lap and know where you are at all times seems to be a dying skill. If you can develop that skill, however, it will keep your eyes outside the cockpit (where they belong most of the time for most PPLs) and will make you much more aware of where you are and what is going on around you.