That will depend a lot on what kind of guns you are talking about. I brought my 12-gauge shotgun and the process was reasonably straight forward with some caveats.Also, do you know who I can contact to find out 100% on the gun regulations in France? Thank you.
Hand carrying your guns and checking them could be a problem because when you arrive you will not have the necessary permits and therefore won't clear customs. Ammunition is a definite no-no.
Mine was shipped but the moving company would not load it into the container until I had obtained advance customs clearance. That required getting a French permit which in turn required me to join a gun club and they issued the permit. Once I had the permit (they run annually from September) I then had to submit a customs declaration form which was then sent to the shipping company. Tedious but not challenging but I had to be in France with a permanent address to get it all done.
If you have other types of guns (hunting rifles, pistols etc) then I imagine the rules will be much tougher but as hunting is a national pastime it should still be possible. I'd start by finding a gun club close to where you plan on living and then contacting them for advice and possible permits.