Well, I don't have the latest version of flash so I can't see the elevation graph, but I assume you are worried about the pass over the mountains. Just got out my French Michelin atlas and the pass you appear to be taking is only at 1650m with a nice cruise down after that. No big deal, just take it slow and kick your bike into low gear. Anything is possible if you are willing to take your time and not pressure yourselves into arbitrary targets such as getting to a certain town by the end of the day or covering a set number of kilometers.