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Changing aluminium joinery to double glazing

Hi, we need help replacing our aluminium old windows /doors to double glazing (we have these ready on site) Number of windows are four, another two windows are getting turned into doors and one ranch slider as well to be replaced, so seven in total .. we would like before Christmas if possible, but we spose before winter for a time frame .. I can't lift the windows, so the Hubby needs help .. Thank you