On June 6, heading south,I leave from Gare de Lyon at 8:07. I plan on catching the no.63 bus St Germain/Odeon stop),close to my hotel at 6:30 a.m. which should deliver me to Gare de Lyon in plenty of time according to their schedule.
On my return trip, I am heading to Amsterdam. My arrival time at Gare de Lyon is 12:45. I plan on RER D (which I've never taken) to get to Gare du Nord to catch the 14:25 to Amsterdam.
Traveling alone. I don't have anyone to bounce this off of.