You should not need tire levers to mount a tire -- they are for getting a tire off a rim.

The proper technique is more easily shown than described, so I recommend youtube videos. Also read up on tips and tricks, such as (1) start installing a tight tire bead 180 degrees from the valve hole, and finish at the valve hole, (2) make sure you are pushing the bead into the rim's center channel as you mount it, (3) leave especially tight tires out in the hot sun for a few hours before mounting, etc. Most important is the actual technique - how you push the beads up and over the rim. Best to watch a good videol

If you are using 'best practice' to mount the tires and still can't get them on the rims, then get different tires. Sometimes I'll even have one tire out of a batch that won't mount, so it gets returned or tossed.

For removing tough tires, I like these.

PS: if you are interested in [MENTION=537095]GhostRider62[/MENTION] 's recommendation, note that there is no company called "Lyzene." He is referring to Lezyne. Though I would recommend against metal tire levers; which would you prefer to break first -- the tire lever, or the rim's sidewall?