Getting from the CDG airport to the Renaissance Paris Hotel Le Parc Trocadero?

I need some help getting from the CDG airport to the Renaissance Paris Hotel Le Parc Trocadero 55-57 Avenue Raymond Poincare. There are 4 of us, no luggage, and we arrive Saturday morning about 8 AM. A cab will be too expensive. Should we take the metro? Or the Roissybus? Or something else? If we take the metro, how does that work with the RER? How far is the walk? Thanks!!!!

Taking the Metro from CDG to Renaissance Paris Hotel Le Parc Trocadero?

Can someone please help me out with getting from the airport to the Renaissance Paris Hotel Le Parc Trocadero 55-57 Avenue Raymond Poincare? There are four adults, two of us will have roll-ons and the other two will have backpacks and we arrive on a Saturday morning. The hotel is by the Victor Hugo stop. I know we’ll have to use the RER also, but I don’t understand how all of this works. Will someone please explain in lots of details? We can take roll-on on the metro, right? Thanks in advance for the help!