Who do I cover side of glass so they are not sharp?

Have you tried using masking tape? You may have to use electrical tape or duct tape if it is exposed to the outside.

What kind of glass?

Mnd, I am sorry, I do not understand your question. If you are trying to cover the side of a mirror, then you can put tape on it, til you are ready to hang it in a safe place. Remain safe, and always watch those edges, ok? Always handle with gloves also. If you are going to install in the bathroom, always leave the door open a bit, to prevent steaming up. If this can't be done, then turn on your vent in the ceiling. Best wishes, J.

they make a special copper tape for stained glass work that might be ideal (it also comes with the non-sticky side colored silver)

a whetstone or stone grinding wheel can be used

in some cases, glass etching paste can also be used, leaving the edges feeling a little like beach glass.

Thank you I think I am going to try the copper tape