Closest mirror door

Thanks for posting. Without know exactly what guide you're working with I can't be 100% certain, but in general with mirror closet doors, you replace the guides by first taking out your door and placing it on a stable surface. Then you can use a pair of needle nose pliers to carefully work the hooks of the old guide out of the frame; or, it's a guide that attaches with screws, you simply unfasten those screws. You just need to reverse the process to install the new hardware. Let me know if you have further questions; if in doubt, send us pictures of your existing guides.