I use 3 irons. The best tips I can give you is to get the first iron in place. Get the bead of the opposite side of the tire in the center of the rim (the deepest part of the rim) and lever the bead of the tire over the edge of the rim.
Take the second lever and take a small bite as close to the first lever as possible.
Then take the third lever and go to the other side of the first lever and take the smallest bite to lever the bead of the tire over the rim.
Then take the first lever out (which is now the center lever), and take a small bite next to one of the other levers. Take the center lever out and repeat taking small bites. If you try to take too big of bites you will just work harder and could end up hurting yourself too.
Use a little dish washing liquid or any tire snot and lube the bead of the tire before you begin. Try not to get the lube on your tire irons or your hands can slip.
It's not easy, but it shouldn't be overwhelmingly hard either.
Without a bead breaker, breaking the bead is the hardest part for me. I take a block of wood and place it on the tire next to the bead and push down on it with my tractor loader. Sometimes I can use an arbor press, but on old tires on older rims, sometimes it takes brute force. My dad used to use the car jack and the weight of the car, but I think that is just dangerous.
