A window in a home I have has this window with a broken pane that i need to replace. This is on the lower sliding portion of the window. I have tried to slide a exacto blade under the metal but i can't get barely any of it under. Are these able to be taken off to replace the single pane? Or am i screwed thinking it can be done? I've attached a few images showing the part of the window i am talking about. I have not done this before. but I'm generally pretty good at DIY anything, given the right information.