2004 Pacifica, window won't open/close
 

Hello,
I believe we need maybe a new regulator in our front passenger side window...the window "fell" open about 1 inch, and cannot be moved up or down.
About a month before this happened, we had to bring the car in because the driver's window fell completely into the door, and it was quite priecy replacing the parts needed.
Is there a way to determine what parts need to be replaced and to do this ourselves?

Thanks-