French road signs are pretty easy to follow. Decide from the road atlas where you want to go, tell the sat nav and look out for signs like these:
Blue for the motorways / autoroutes, green for the ordinary roads / RNs
As you have to pay for the autoroutes in France it's in the sign providers interest to direct you to them and it can be tricky at times to find your way out of some towns by ordinary road. That's where your sat nav will earn its money.
I wouldn't worry about Switzerland at this point. By the time you get there you'll have got the hang of things.
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