OK, Ben we are a group of 4 traveling to Paris in July. W

e would like to get our feet wet early by taking the train/metro from CDG to our hotel. Our flight arrives mid morning on Tues 14 July....a holiday...at Aerogare 2 Terminal A. We want to get to our hotel, The Inter Hotel de la Bourdonnais. It said something about taking underground line 8 to the Ecole Militaire metro station. How would one do this? Do we transfer from the RER to the metro system. Our first time in Paris. Thanks in advance for your help!!!!!