ya if you dont have tire spoons, just use 2 flat pry bars. iv'e found 1 1/2 - 2 inch wide work best. the hardest part is getting the first bead over the rim, as i'm sure you've noticed (sorry for pointing out the obvious) start with the pry bars together using one to hold the bead over the rim where you started and work the bead over the rim around from your starting point. (when doing this i wished i had three hands) ALSO it's a little messy, but last time i did it, i used some bearing grease or some thing similiar. the tires i put on were 31 x10.5 too. the first took me about 20 minutes AFTER i finally figured out the best way to go about it. (the soapy water kept drying too fast, or i was moving too slow probably the latter... <img src="/forums/images/graemlins/lol.gif" alt="" />) never tried the explosive method to set the bead i just wacked the tread with a half jack while simultaneously holding the air chuck on the valve stem to provide pressure from within. took a few tries but worked eventually. i've also heard that a rope cinched tightly around the middle of tread is a little more effective than the method i used to set the bead.
good luck!