Changing a wheel is straight forward... made sure my wife knew how to do it years ago but I also make sure it's straightforward for her. You should make yourself aware of where things like the Jack and wheel wrench are.
Tips.
JUNK THE LOCKING WHEEL NUT ADAPTER and LOCKING NUTS, They are a bit of a throw back when Alloy wheels weren't the norm, not many cars come without Alloys now so they aren't "bling" any more.
Next time you are at the gagare get them to coppercoat everything. Coppercoat is a greaselike stuff that prevents your nuts siezing on the hub studs. Go to an autoshop and get an extending wheel wrench, it'll give you more force.
Don't panic about power tools, the nuts are torqued only to a certain and they should be manageable
If all else fails buy a can of tyre weld, unless your tyre is totally trashed ikt would probably get you home