|Subject: Re: RER from CDG|
Hi Sandy and others,
I haven't done that exact route, but as I wrote, have used this basic method many times.
I looked up the site (www.ratp.fr) and on the welcome page, at the left side and down a bit, under "Service-clés" the first thing is "itineraires". Clicking on that takes you to a page where you can put in your starting and finishing location and they'll give you a short description of the steps to take. You can put in your preferences, such as what means of transport you prefer, and whether you want the fastest, least walking, or least number of changes. I think the site has an English option.
Anyway, your thoughts on how to do it are exactly correct.
Have a wonderful time! Pat in California