Levers are for suckers. Good in a pinch, but your form is all wrong if you rely on them for every tire, every time.

Just have to do it in the right order. Put one bead of tire on rim. Inflate tube till it is round, but no pressure in it. Place it in tire. Push it on up in the tire, you may have to let a bit of air out as you go. Now that the tube is up in the tire, push the bead that is already on the rim to the middle of the concave spoke bed of the rim. Now start putting the other bead on, starting with the valve stem, working your way to the other side. You should be able to bring up enough slack to get the bead to pop on. Sometimes it is really tight and you have to work at it... And sometimes you need tire levers, no question.

-brad