I have info on how to place the glass. I guess you are going to place the bottom on the sides with the tank upside -down? First off you could where surgical gloves -this will help with oil from your hands. Second - Glass shops use Big Suctions cups with handal's. They are made for the purpose of moving sheets of glass. You could buy or barrow a set of these. That would make placement of the glass easy. No need to touch the sides at all. I have constructed tanks with bare hands (cleaned with Alcoholic) and never had a problem! Silicone squishes out everywhere and you just clean up the access.
Good Luck, Arkangel77
Good Luck, Arkangel77