Spent a week in the Pyrenees last summer. My main tip is to make sure you’re not there too early in the season for the lifts to open. We were there mid-June and no lifts were open anywhere. Some amazing trails in Bagneres de Luchon, we had no guide so used Strava to find them, which worked well. If you’ve got a car, I’d suggest heading over to Ainsa for a few days, rode the best trail of my life there in the only dry day of a very wet week. Saint-Lary Soulan also has some excellent riding, with a printed map available in the bike shop in town that has loads of riding on.