Since getting inside Vatican museum became increasingly more difficult over the last few years because of security and crowds, a new business developed around St.Peters square. You will see lot of people supposedly selling guided “skip the line tours” into museum. Those are not official tours and are likely being scammed. Make sure you buy your ticket through official resellers either in the tourist offices in Rome or online . One good option is “skip the line with breakfast” - our friends booked it after hearing my horror stories of fighting crowds inside the museum. That package cost about 50 dollars but you get a breakfast and your get in early.