It's not hard at all, even if you aren't mechanically inclined! But you will need 2 people to do it. Mainly so you don't drop the old or new glass. There are several screws on the inside of the door, while someone is holding the glass, remove the screws, then remove the old glass & the frame on the inside of the door. I then removed all the old caulk, and cleaned up where it was. I then installed the new caulk (rope type caulk, ours came with the caulk) where the old caulk was. Then while DW was holding the glass & made sure it was straight inside the opening, I reinstalled the frame & screws. I only removed the frame on the inside of the door. Didn't think about taking photos until I was almost done. Also, at least on ours, there was an inside & outside of the glass. I don't know what the difference is, that's what my supervisor told me! We also kept the old glass, so when we upgrade, we can remove the stained glass to put on the new rig & put the original glass back in.