63 Shasta SC front two flat windows need repair....

OK, So I have been watching videos, and visiting repair sites.  I have throughly inspected the front of the trailer.  My two front flat windows are broken, and I want to give replacing them myself a go...   It seems to me there are four separate pieces that hold the windows in- The Left and right sides, and the tops of the windows and the bottoms seem to be independant.  My assumption is that if I removed the screws holding the metal frame on the sides from the trailer, I would have a little more wiggle room to get the glass out and take them to a glass shop to be replaced?  According to directions on another site, they are spring loaded to hold the window in place?   I havent found a video on replacing the fronts, unless I have completely missed it.      

I figure I will give it a go, and if I absolutely cannot do it (I am pretty handy), I can truck it down to the vintage trailer repair guy...