how to dismount 39.5 bogger?

[full foot notch]

hey, yall, looks like someone locally wants to buy the 2 boggers out of the full set of tires that i have, but he does not want the rims, and the rims are 15x12, so my question is, how can i dismount them by hand, with a very limited selection of tools, i can get the valve core out and let it drain out, and after that, how can i pop the bead, i dont have a highlift to put pressure, just a 330 lb body, heh, and then after that whats the best way to get it to come over the bead so i can pop out the rim if ya know what i mean

dont have a pickup or truck right now to take em to a shop for them to do it, thats why im askin