We did not take a tour, instead traveling by ourselves, by train, to Lucca. By the time we'd managed the multiple connections it took to get to Lucca, we had only two hours there before we had to return. We wouldn't attempt this again.
I liked the comfort of being transported to Rome and back by bus. Rome was bursting at the seams with visitors, and although I enjoyed being able to see some sights I'd not yet seen in the city (I'd spent a week there years ago), I was dismayed with the size of the crowds.
We were told we could easily reach the train station on our own. Not true. It took nearly 45 minutes of hard walking through the dirty streets of Naples to find the station, and then some more time to figure out where and how to catch the train to Pompeii. I would take an excursion and be transported by bus.