I have driven in London, Edinburgh, Birmingham, Amsterdam, Paris, Brussels and many more cities.
The answer is, don't think about how you drive at home, just concentrate on what you are doing in the new location and do a search on google for laws and rules in each country that you intend to drive in.

An few examples of knowing what you are up against before it happens.

When I lived in Amsterdam (I don't know if it still applies now) If you were on a roundabout, you must give way to somebody coming onto the roundabout.
If somebody was crossing on a Zebra Crossing, don't stop for them, just manouvre your way round them- if you didn't you had somebody straight into your arse.
Don't argue about who has right of way with a tram, becuase you are probably in heaven.
Always give way to cyclists.