Autofill small things in real photos locally - need help

Hallo, Tldr; Is there a good online guide on how to fix/autofill small parts of an photo locally with AI on weak GPUs? What models to use, what settings to use, negative prompts, positive prompts, LoRA checkpoints? VAE CFG and other abbreviations I have no Idea about. If possible within Krita. Long version: I am looking for a way to fix / autofill small parts of a real photo. I know there are a lot of online tools where you pay your tokens and then hope for the best. And to be fair, it works pretty good, of.