How to replace glass screen on Samsung Gear S2 Classic watch face?

How to replace glass screen on Samsung Gear S2 Classic watch face? Glass on Samsung Gear S2 Classic Watch is cracked on edges and has been slowly falling away (There is a screen protector on it that has helped keep it together, but it is slowly falling away in bit). Touchscreen still works perfectly, so the digitizer seems to be fine. I just need to find a way to replace the glass, and did not know how easy or hard it may be. Thanks!