Put the glass on a pair of sawhorses or something similar. Clean all round where the gasket goes, then install on window. Should fit fairly tightly. Install moldings (not the bottom one, of course) in the groove. Make sure they are fully seated -- watch the corners, then wrap wire or heavy string around the groove that goes over the body flange.

Stand window in opening, bottom lip can usually be started at least partially over the flange. Pull string out while pulling toward center of window to flip the edge of the seal over the flange. Go slow in the corners, these are the hardest parts.

A helper to hold the window in place is very useful!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!