Yes, all good advice. Two more things to consider. Sometimes navigation is about knowing where you are not... Not in controlled airspace without permission, not about to fly into a lowering cloud base, not about to hit a mast or pointy hill.
Second point. On a diversion, if there is a unique unmistakable feature to follow, that goes to where you want to be, then use it.
Sorry, one more point. Don't rush. As long as you have fuel and daylight you are good. You can get a rough fix on a vor, at least along a line, even if you can't plot two VORs to any degree of precision. You can even fly to the beacon (or big unmistakable town, island, airfield, whatever as long as it is a positive fix ) and then start from a known position.
Know how to use the equipment in the aircraft. It cost someone a lot of money. You are paying to hire it, so may as well make use of it. That includes the radio. If you are really not sure about nearby airspace or obstacles then get help early, before you bust the Heathrow control zone.
If you are lost, you won't be the first or even near it. If you can't get unlost by yourself, admit it. It's not easy psychologically, but it's much easier than explaining to the man from the CAA how you ended up overhead Paris when you meant to go to Le Touquet.