I find that if the edge of the glass is wet, the hinge usually goes on easier but this does make the glass harder to hold.
Are you sure you bought the right hinge size? It is sized for the proper glass thickness, usually 1/8" thick for smaller tank sizes and 3/16" for larger tank sizes.
Are you sure you bought the right hinge size? It is sized for the proper glass thickness, usually 1/8" thick for smaller tank sizes and 3/16" for larger tank sizes.