Here goes. Don't try to spread the clip with a screw driver. All you have to do is take pliers with sharp jaws, by that I mean the nose is 90 degrees to the face of the jaws with a relatively sharp corner. Next put one nose on the open end of the clip, the other on the pin, squeeze and you should have the clip on top of the pin. Give the pliers a little twist to move it the rest of the way.
To put it on just reverse this from the other end.
Or use needle nose pliers. Lol.