Pompeii tour guides - hire at the gate?

https://community.ricksteves.com/travel-forum/italy/pompeii-do-you-just-show-up-and-buy-tickets-guide-audio-guide-questions

We did this and were happy with it. We were lucky that the group got large enough that it was divided into two smaller groups. The tour was about two hours long which we found perfect. We had lunch and wandered some more on our own afterwards.

That’s what I did and it was fine. The tour was about two hours. I then walked around an hour on my own.

We booked a tour through Airbnb. It was terrific.

Buy sandwiches outside the gates or bring your own food and drink. What's available inside is very limited and requires being in long line.