I wrote this up a couple of months ago...
First thing to figure out is what time one needs to arrive at the airport.
For major airports (MCO qualifies), if I'm checking bags, I try to arrive (walk through the doors) 2 hours before my flight. That's my starting point. I have TSA Pre, and I might subtract 15 minutes (arrive 1:45 before) for that. Don't have to check luggage? Subtract another 15. Want to get fast food after security? Add 30. Sit down? Add 60. Uncomfortable/unsure/not confident about navigating an airport? Add 15 minutes.
So my "time to arrive" can be anywhere from 1:30 before the flight to 2:30 depending on conditions.
Note: I know this is very conservative. But I'd would rather wait at the gate for an hour than show up 1 minute after they close the doors.
This also allows for some contingencies...
* Ride share delayed or canceled? Get a cab.
* Luggage checkin crowded? Use self serve terminals or porters outside (if available). NOTE: If you use porters, customary to tip $1-2/checked bag.
* Everything goes wrong (transportation late, traffic, long security, etc), skip food and get to the gate ASAP!
"The busiest travel day" was yesterday (generally). I might add 15-30 minutes for a "busy" time.
Make sure you have your ID with you, preferably a "Real ID". If you don't know what that is, look it up. If your ID isn't "Real", I'd add an hour because they'll do supplemental checks.
You get to the airport.
I suggest going to the airline check in counter to check your bags, assuming you're doing that. Self serve kiosks are fine, but if you're not familiar with what you're trying to accomplish, could add stress.
Go to security. Get into the appropriate line (TSA Pre or "Standard").
You'll be asked for ID and possibly boarding pass (paper or on your phone). They might ask you to stand in front of a camera to confirm the ID matches.
You get past the security check, put all carryons through the X-ray, either in bins or just on the belt. Listen to the officers on what electronics you need to take out. Empty your pockets, etc.
You'll step into a machine, put your feet on markers on the floor, hold your hands above your head, let it scan, then step out. Depending on what the image says, you might need to be wanded, or they might "pat down" an area.
Then you collect your stuff (unless they need to open your bag, which they'll let you watch as they do), and go to the gate.
Check monitors at the airport to confirm your gate.