No problem – I should have said, the TGV may also work if you don’t want the overnight. I would probably look to do Paris -> Lourdes/Tarbes direct rather than going via Toulouse – the former is about 5hr, the latter 4h something plus the 2hr back…
Really like the Pyrenees – it’s a great part of the world – super food, mountains, cycling, walking, places to visit etc (though personally I’d get in and out of Lourdes as quickly as I could…)