Replacing window and sliding channel

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Help once again I have to ask for help from you guys.

i have just replaced the front window glass and sliding channel on my 1954 Hudson Hornet sedan it was a bit of a nightmare but it’s done now I have to do the rear door window and channel this looks to be a bigger challenge I got the old one out but it looks like you fit the new window with the channel actually on the window and slide the whole thing in I don’t want to brake the new glass any advice will be greatly appreciated thanks guys