I know you wanna do it yourself but, I'd take it to a dealer and let them have the headache. Not to mention a warranty. Have them pull the window, you transfer furniture, have them reinstall the window.
2013 Jayco Eagle 328 RLTS
2012 Ford F250 6.2L 4x4 CCSB W/Air Lift air bags
2002 Coleman Bayside Elite (traded)
Me, Momma and Charles (RIP buddy)
And introducing Sofie!! ;)