Replacing toyota tundra driver side window? How do you get the glass in ?

I was weed eating and a rock hit the driver side window on my 2001 Toyota tundra. I was thinking....I will do it myself. How hard could it be? I went to junkyard and bought window and brought it home,pulled inside panel off,disconnected all wiring. I tried to put window in at angle and pull it into the track.....it got stuck and I was lucky it didn't break trying to get it out. I kept trying and could not get it. There has to be a trick to it. Please tell me. I cannot find any info. on websites either. PLEASE HELP!