There is no equipment to buy. You car comes with a lug wrench, a spare and a jack.I'll be buying the equipment and doing it myself next time.
While not ideal, I've done it many times this way. Just remove one tire, put on the spare with 2 lug nuts. Continue around rotating tires until to replace the spare. Personally I like to use a torque wrench when done, but I will almost guarantee walmart won't.
Just tighten them tight and recheck after a few hundred miles.
Ideally get yourself a set of jack stands and a floor jack.
With a Subaru there is nothing required for the TPMS.