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If you want to be assured space in carry on:

1. Double check the rules before you go and verify everything you are taking is allowed.

2. Purchase some sort of ticket that has priority boarding (also make sure you are at the gate enough time ahead to take advantage of it). First / premium economy.

3. If we run out of space and you must check something. You may be upset: If you argue, and escalate the situation- it probably won’t convince us of anything, we will just call the police and have you removed from the flight. 99.9% of the customer services agent (and their supervisors) job is defined by clear procedures that they have no control over.