In general, it's just like home, No issues at all. the exception, and it'll be signposted by a cross on a Triangle (If I remember correctly) is in smaller villages or in the countryside where they want a little calming. This is where you'd need to be vigalent in any case.
There never used to be any rules about giving way...and some older drivers don't give a toss about the new Code. Just keep your eyes open to the left and the right.
The 'give way to the right' is, as described by Rob, denoted by a cross inside a triangle, and if that sign is not there you should assume it is anyway. Having said that, there are regular roadsigns that tell you when you have priority and the 'give way to the right' rule is getting far less common than it was, most of the time nowadays the major road has the right of way just like it does here although there are always the old codgers.
Likewise the old 'give way to traffic joining the roundabout' rule is almost always superceded by the 'give way to the traffic on the roundabout' rule, the same as ours (except of course you give way to the left). before that roundabouts were always a nightmare for me. For some reason when I approached a roundabout I would always remember that I had priority and would go steaming straight onto it, only to remember a fraction of a second later that everyone was piling on the brakes to give way as traffic entered from the next turning
Last time i didn't even think about it apart from one occasion in Caen when someone stopped in the main road to let us out of a side road. I'm more worried about riding down a fast main road and having a tractor pull out in front of me.