The way I do it is I use one jack.
Do one side at a time.
Take off rear, install spare.
Take off front, install tire that came off rear.
Remove spare and install tire that came off front.
Rinse and repeat.
+1 only but since i have two sets of rims/tires instead of spare i use either a winter or summer tire depending on the season...takes a little bit of time, but is worth the hour and a half...plus you get to clean the inside of the wheel wells...