Well, something to break the bead
Something to pry the old tire off
Something to lubricate the bead to ease the process
A fresh tube+ (2, which would be a 1 mistake margin)
And something to not only help seat the bead, but also get it back down to proper pressure.
Some ideas: a big assed C clamp and a couple scraps of wood, big cheap screwdrivers dipped in plastidip, a bottle of dish soap, uhhh, tubes (tire...duh)and a high quality air compressor (harbor freight is a good on for that) or a quality VOLUME bicycle pump.
Or get spendy.