A prologue:
When you arrive at your gate, which more often than not will be the last gate of your terminal, take a seat and proceed to talk on your mobile phone until the last possible second. Once the gate attendant announces that the BOARDING PROCESS will begin, rush to form a line (preferably 3-4 people in width) that extends out into the terminal. Even though the attendant only called for First Class and Passengers Needing Assistance, and despite the fact that you are in Seating Group 5, it is imperative that you crowd the gate if for no other reason than to block and confuse those in Seating Group 1.
Notable exception: when flying out of the Cancun airport, the airline may or may not alert the passengers when boarding begins (or when the flight is expected to be delayed). In this circumstance, you must not get lulled into tequila-hazed oblivion by the ubiquitous Jimmy Buffett tunes, but remain alert so as to form the giant line at any given moment.