Shure MM Stylus are Very Easily Changed, they are entirely self-positioning:
you just hold the front with your fingers (no tools needed) and pull them straight out at the angle of the bottom of the cartridge body, (as shown in the photos above) and push them straight in, all the way,
no need to be gentle, you cannot push too hard or too far.
no need to squeeze to make anything happen, simply pull it out (no snap, no click, nothing, just pull out/push all the way in),
just squeeze tight enough so you don’t drop it when it slides out, that’s the only concern.
The cantilevers all go within a tube that only fits one way into the body, the shape prevents twisting, and the plastic front both stops and aids in the positioning