I have posted my thoughts on tire change many times.
First, pick a nice day, and change a tire at home. This will make sure you have what is needed, and know where it is and how to use it. Don't want to have school in the dark and rain with traffic blasting by.
Next thought; To work most jacks likely to be carried, you need to be mostly under the vehicle. Not a issue, you can watch the jack, and if it falls you have as much room as you crawled into. But often somebody will jack it up, get the flat off, and discover need to go up a little bit more. Do you put the flat back on, or take the chance?
IMHO, a much better plan is pull that flat up on blocks so the center of axle is a little higher than when setting on inflated tire. Then put jack under, and lift until the block will move. Crawl out, remove block and flat. You will have room to put spare on. As a bonus, you don't need to pump or crank the jack near as far.