No where near as bad as I thought it would be. Everywhere there are these box things for you to see if your carryon is the right size. It is basically the shape of a decent sized laptop case. You can get the actual dimensions on the airlines websites. I had a rolling cosmetics bag which was correct in the length and width but was deeper. I had no trouble getting on with it. At many points airport people asked you about cosmetics, but bags were not searched. There were lots of people working and things were organized and efficient. There was fairly thorough body search done.
I traveled with another girl and we combined some packing. We each had our larger suitcase and then we combined in one smaller suitcase that we checked all the cosmetic type stuff that needed to be checked and combined one carryon things we wanted to have with us. It worked out well.