Why do you struggle to mount tight tyres when shop mechanics can seemingly do it easily? The first answer is technique, but the second answer is the Kool Stop Tire Jack. It has saved many fingers from being shredded mounting tight tyres, and now it can save yours too!
Just hook the jack under the bead of the tyre, with the other side of the tool resting on the rim, and roll it up over and into place. If you're struggling with tight road or tubeless tyres, this is the tool you need.