someone talk me through being a featured snippet?

You pretty much have to rank on page one first, snippets come from pages already near the top. Then: put the question as a heading and answer it directly in the next paragraph, roughly 40-60 words, no warm-up. If the answer is a process use a numbered list, if it's a comparison use a table. Look at what the current snippet is (paragraph, list or table) and match the format but answer better. On a lot of queries the AI overview now sits above it, so it's worth less than it used to be.