The best advice that can be given is to take plenty of care until you are used to the system. The most dangerous turn is now a left hand turn across the flow of traffic.
There are other things to remember such as :
There are other rules which may apply, such as in France right hand drive cars must adjust their headlights to prevent them dazzling drivers of oncoming cars. Beam converters can be obtained from most garages and petrol stations. Also in France a flash of the headlights means “I am coming through with priority” not “please come through” as it would in the UK.
We have a Country Guides section with info and advice on local customs for Europe.