It’s really worth using a professional guide. We saw the huge queues to enter the Vatican. We go straight. The guide was very interesting, he explained many things about what we were seeing. I can’t imagine doing a Vatican tour without a guide. We would have been walking around in there a little lost without understanding anything! We saw all the most interesting and important things. I strongly recommend! It was a great experience. I think our guide was Olga. Anyway, the person explained things very well and we liked him a lot.