With this reputable tour company, it was a relaxed and easy day. They held up a sign at the train exit and whisked us away to the air-conditioned van waiting right outside. Our guide maneuvered the streets and parking with the experience of the Parisian and the knowledge of a certified guide. He talked to us about the history surrounding Paris and took us to some of the best local locations as he led us to every must-see site we could fit in a seven hour day. We even went to Versailles and toured that lovely palace, that I highly recommend seeing, right before settling us into our hotel. Before you ask "how much?", let me be upfront that it is expensive. Converting US dollars to pounds made it even more so. That being said, it is the company we chose since we had such a limited time to spend and determined the bulk of our travel money should be spent on this type of tour. In London, it was very easy to get around without a private tour. Just having a common language (for us) in England made London a breeze. France is France. The charm is in the difference. However, that difference can get you caught up in a hot day, spinning your wheels trying to find one or two must-see places. If you do choose to go it alone, just make sure that you do your homework before you leave so that you can make sure and get to where you want to be without a lot of confusion.
Below is a video of the outside of Versailles