1995 BMW 525 window off track

Hi, My drivers side window fell into the door. I removed the panel and found a window slide broken off. I have ordered new slides but the window itself seems to be out of the vertical guide track that I think I can feel in the front of the door. I have not installed the new slides yet, but am worried that when I do, if the window tries to raise out of alignment it will damage the glass or new slides. Am I right that there are vertical guides and how do I get the window back in them? Thanks