With the help of a friend set the new window glass in place.
How to replace door window pane.
Hold your putty knife at a 45 degree angle with the glass and tilt it to touch the wood on the window sash.
Use a heat gun to soften old glaze.
Start at one of the corners of the window pane.
Wiggle the pane into the putty while applying even pressure with the tips of your fingers.
Apply new glazing and set window glass use a caulking gun and squeeze a thin layer of window glazing compound in the primed grooves.
To replace a pane of glass you must remove the old pane and if the pane breaks in the process thoroughly clean around the window to remove glass shards.
If any voids show under the glass pull out the pane add more putty and start over.
You can then scrape old glaze off with a painters knife.
Peel off any excess putty that comes off.
If your window pane is glazed follow steps 1 and 2 above and then use the following steps.
You then clean the frame and prepare it.
Insert new pane of glass.