Welcome ERS:
It is possible to replace the glass yourself but not the best way to go at it and you may not get good results (condensation between panes).
There is usually an aluminum spacer between the two, the glass has to be perfectly clean, warm the two pieces of glass, put a bead of silicone caulk on the aluminum and place the two warm pieces together. As the glass cools a vacum will occour between the two to keep it sealed.
Glenn
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