Since I busted my Coats manual tire changer,I have been resorting back to my old standby method of bead breaking,using an old bumper jack that has a square base,I place it on the tire as close to the rim as I can,and hook the bumper jack hook to my K2500's rear bumper..its worked every time so far..I find leaving a tire out in the hot sun a few hours makes a huge difference in the amount of effort you'll use dismounting it and installing it..liquid dish soap helps a lot also..
You can buy "mini-tire changers at Northern Tool ,for less than 100 bucks,(I think 75 even)..a good bead breaker might cost almost 75 too...by clamping a axle shaft in a bench vise,you can use that as a crude "tire machine" to hold the rim while your putting the tire on it..
..for smaller tires breaking the beads can be done in a bench vise,running it over,sometimes just a whack with a hammer and a wedge tool does it...I like the bumper jack myself..