Has anyone planned a trip to Italy?

I found two motor coach tours that I like, but the itineraries include stops that I wouldn't choose on my own, and the tour company has very mixed reviews. One of the tours is ten days with overnight stays in Rome, Venice, and Florence. The other tour is 14 days with overnight stays in Milan, Venice, Florence, Sorrento, and Rome.

Is Italy a place that I could easily book hotel, sight seeing tours, and figure out transportation easily on my own? Would it be worth it cost-wise???

Give me all your tips, tricks and recommendations for DIY planning. We are going in September.