The NOOB ComfyUI Install Guide
Way easier than other UIs.
If you are on windows with nvidia it's literally just download + extract:
Then download this (it's a SD checkpoint):
Open up the dir you just extracted and put that v1-5-pruned-emaonly.ckpt file in ComfyUI\models\checkpoints
Then run ComfyUI using the bat file in the directory.
Then press "Queue Prompt" in the UI and wait a bit.
And you have your first image.
ComfyUI supports loading the workflow from PNG files that were generated with ComfyUI so load the PNGs on the examples page and have fun.