Corner key replacements

A quick learner from United States says:
I saw your video which described how to change the corner keys and latches on a window and one that described the process for the corner keys on a screen window. The hardware parts i need and ordered from you yesterday will involve peening. For my project, I would think that prepping the entire frame before glass placement is safest. The glass panel should hopefully squeeze into the bed of the frame and then be secured to the frame with the gaskets. Am i overthinking this?
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Dave Sr. from SWISCO responded:

I am reviewing your most recent order with us, and it seems the type of parts you ordered leads me to believe you may have a "drop in" type glass frame. First thing you want to do is carefully remove the glazing spline and glass from the frame. Take as much time as needed to get this step completed. In some cases the glass might be held in with some type of adhesive. Most of the time, in repairing older frames, the glue is dried out which makes the glass loose in the frame. If this is not the case, you will need to use a heat gun on a low setting or some type of solvent like Lacquer thinner for removal. Again, I want to emphasize to take your time, be as careful as possible, and wear gloves. After you have removed the glass you will need to take the frame apart and remove the corners and latches. I am also going to place a few videos below that may provide some additional advisement. 

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