Not sure if I'm doing it right but have done several with no problems.
-Clean off old residue. (when no one is looking I use coleman gas and a soft rag)
-If you have spacers to hold window in place (up and down) don't leave out and make sure they are centered.
-I like to use "tackey tape" The name is written inside roll of tape. Much better than regular tape IMO.
http://www.kasonind.com/index.php/products/fabrication_supplies/7513_tacky_tape/Get most anywhere. I like to put on two layers thick. Just mash in place with thumb and peel back paper as you go around frame.
-Screw in screws. Screw in about 1/2 way to 3/4 then screw in a couple thread at a time like your torquing anything else with a bolt pattern, going side to side to pull in evenly.
-In about two months after tape has gotten "mashed out" a bit, take a pop cycle stick and trim. (Maybe best to stock up on pop cycle sticks I tell wife)
-put a very, very thin layer on RTV clear on top of and sides. RTV is just to help water moving. So small that you can't see it when washing or waxing
-Misc notes
-If you have to mess with a very plastic trim known a "window ribbon" a heat gun or hair dryer to make plastic more easy to work with.
-The last window I did was a real challenge. It was a factory "defect" that everybody thought was a leak around the frame, but just factory seam at bottom of butyl had tiny hole at overlap of seam compound. Found
http://www.hehrintl.com/pdf/Hehr%20Service%20Manual.pdf to be helpful after you slug thru and find what your need is.
NOT saying my way is best, just what I've done; your window might be entirely different.
