We are planning to get a guided walking tour in September, the 19th.
Do we have to queue before meeting the guide in order to get the entrance ticket?
No. The guide will meet you there, and will help you to by a ticket in the fast lane
Yes, you do have to buy your own ticket at the entrance but I went to the museum in Herculeum the day before so I could both learn more and save time on the line at Knossos. i bought the ticket for both. Truth be told, the day I went, the line was not bad at Knossos. it was In April so before the season. You may be after the season.
Get an answer from Knossos Palace Guided Walking Tour staff and past guests.