If you ordered glass and frame it should be a straight forward job.
If you are just replacing the glass in the old frame that is a different issue.
I replaced my glass with a piece of Plexy. The problem is getting the frame apart. The 2 aluminum sections are connected with a met insert that, in my case had galled to the aluminum and I had to make a jacking device to separate the sections.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles