Agree with most of the recommendations (arrive early, arrive earlier than that because it's your first time, don't sweat the small stuff, flying is actually quite easy).

One point of disagreement. Window Seat. What on Earth for? Want to see the view? After the first 2 1/2 minutes you discover that the view never changes. Want to see what it's like? Go to Google Earth and set the view level at about 35,000 feet then tilt your head at an angle (because you can't look straight down from a plane) and then stare at it for 5 minutes.

Downside to a window? You're pinned there. If you need to get up for the restroom, you have to get others out of your way. If people are asleep you have to wake them. If it's meal time and their trays are down, you have to "hold it". Want to get at your bag in the overhead? Tough. Time to get off the plane you have to wait for them to decide to move.