Interesting question. If you are asking for an LLM (that is self-hosted and can do that?), you're going to need to provide some significant tooling, like rag / documentation, troubleshooting, sort out concurrency, front end etc. Honestly...it just easier to point them at a YouTube (network chuck has good stuff).
It absolutely can be done and it absolutely can be valuable - for you personally. But if they're having trouble doing basic things like installing jelly fin, they have zero chance of doing something like that themselves.
Honestly, I think your easiest option for your non-technical friends is just to point them at one of the cloud providers, like chatGPT or Claude.
OTOH, how much work are you willing to put into this and what's your GPU / LLM set up like?
Your basic foot in door starting point is going to be installing and provisioning OpenWebui, getting a good local model up and running (Qwen3.6-35B or Qwen3.6-27B) and creating a "Knowledge Base" in OWUI with requisite documentation.
If you're serious about this, write back and I'll thumbnail sketch it out for you. It's a good project and I've done similar.