Buy the Miam Maim Dodo guide book, it is worth every cent you pay for it. You don't necessarily need to be fluent in French but knowing the language helps. April can be cold, I started in late May and encountered sleet and snow and then a heat...
Your best bet might be to inquire directly with the tourist office in Le Puy:
https://en.lepuyenvelay-tourisme.fr/sejourner/pratique/les-bureaux-daccueil/
I have hiked across the Aubrac Plateau twice and missed a late April snowfall by just...
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