If I may add to that tire-changin’ discussion: Most guys depend on upper body strength. Your BiL may not think to instruct you to STAND on the tire wrench in order to loosen or finish tightening the nuts.
Just remember: Righty-tighty, lefty-loosey! Make sure the nut is fully captured by the wrench head before applying your weight, with the wrench handle roughly horizontal or slightly downward so if it dumps you, your foot doesn’t have far to slide to the ground.
Before I ever got to take off with the car at 16, my Dad made sure I could change a tire, do a jump and change the oil. Kinda surprised me the first time or two I swapped out a tire myself & it didn’t come off just because a girl had put it on, LOL. Don’t worry, it’s easy & all common sense.
Maybe a crowbar & scrap of wood as fullcrum to help elevate the new wheel onto the hub, just depends on your sense of balance & control.
Another option (that’s useful for so many things) is to carry a sturdy length of iron pipe in your trunk. If you select the right size, you can use it as a slip-over extension for your lug wrench and thus increase your leverage.
Thanks to both of you for suggestions. I would either have to change the tire myself or go to a singles site and find a man to do it. I’d probably find a murderer on a singles site so better be able to do it myself.