Eyes,
I am very pleased that you have asked this question because it is an issue which has always worried me and which, for some reason, is rarely discussed.
Navigation doesn't normally bother me too much en route as I can identify land marks to the side or even behind me. Where it really bothers me is on the approach to some airfields, when approaching from the East. For non ATC fields with an overhead join it's not normally a problem but when there is ATC and you are asked to report "field in sight" either for a straight in approach or for downwind join, it does worry me. I usually tell ATC of my difficulties and, so far, they have helped me out. But I do get the impression that many pilots are reluctant to tell ATC that they can't see, perhaps afraid that someone may decide that they are not in VMC which, looking one way, I suppose that they aren't.
I hope that this topic elicits the usual helpful ideas from the more experienced among us.
P1