In addition to my slightly 'tounge in cheek' reply.
Clock, map, ground ........ basics basics basics. As long as the route is well planned, well studied and correctly annotated on the map (chart if you wish) then you need to stick to those three basics as any track error will very quickly become apparent.
One of the biggest mistakes I see is that people try to pick small, indistinguishable ground features as turning points. Take a tip from the military here, to start off use great big ones if possible with vertical extent if they've got it. Then wean yourself onto progressively smaller and smaller turning points. The CAA examiner might not be so kind as to give you a thumping great power station as a turn point.
Finally, practice. It's not as frightening as you might imagine and can turn out to be good fun.
Good luck
W2P