It really depends on how deep you want to go. And this will likely not be useful in any way, other than a new hobby. Me and my friends who do this kind of thing, we do it for fun.

If it was not fun for me, I would not have bought 3 GPUs just to run better local LLMs. Actual time, effort and money spent on my local setup compared to the value I get does not justify it at all. For 99% of the things I do I could have just used an API and paid like $17 in total. Though it would not have been as fun. For the other 1% I could have just rented some machine in cloud and ran LLMs there.

If you don't have your private crypto keys in your notes worth millions, but still worry about your privacy, I'd recommend just renting a machine/GPU in a smaller cloud provider (not the big 3 or 5) and do these kind of things there.