Agreeing with backpacker on receiving assistance but why not invest in a GPS. My understanding is that your navigation technique is fine and you know what you are doing but you will have your head in the cockpit for a minute too long and then you look out and you get a bit disorientated and things seem a little unfamiliar..
I don't think you will be allowed a GPS for your PPL skills test (although I used one on the IR) so I am not sure.
Many people will say it will make you sloppy with navigation the old fashioned way. I personally now would never go on a VFR flight without one (unless its far away from controlled airspace!) it just frees up your mental capacity as you have a backup navigator, and allows you to enjoy the flight more and concentrate on other key aspects like fuel and weather etc..
By no means nav completely on a GPS but as abackup aid to lower your workload I think one of the best buys around.