Install ComfyUI manager if you don't already have it
Load the json file or drag and drop it inside comfyUI in browser
Open ComfyUI manager and select Install missing custom nodes
You can also drag and drop preview images in ComfyUI to get the exact wrokflow and prompts
Read important notes below to fix common problems

Important Notes

Update your comfyUI and the required nodes to the latest version (if you don't, you might get a VAE error from FaceDetailer)
Enable lora auto complete in settings (comfyui custom scripts addon)
Hand Fix sometimes cannot identify hands in your picture and returns an error if the mask is set to "tight bboxes". just set it to "based on depth".
If you want to disable any section e.g. HiresFix, You should Bypass the nodes in the group and also use the on/off swith on top of it. I know it's annoying but I couldn't fix it. if you use bypass only, it cannot proceed to next steps. If you switches only, the ksamplers still do their sampling wasting time. That's why you should do both. If you know a better way for this, please leave a comment.
You might wanna also use controlnet between handfix and latent hirefix if it messes up the hands.