Documenting how things really work, not how they should
An SOP that doesn't match how the team actually does the work is a fantasy document.
Watch first, write second
The best documenter watches the work being done and writes what they see. Top-down 'this is how it should work' SOPs are usually wrong.
Pictures and videos beat paragraphs
A short Loom or set of photos communicates more than a wall of text. The team is more likely to consume it, too.
Owner doesn't write the SOP
The person who does the work writes the first draft. The owner edits. SOPs written entirely by the owner are usually ignored.
Take your version of this question further
This is one operator-tested angle on the question. Your shop, your size, your trade, and your team change the answer. Ask your specific version inside Ask a Shop Owner to get a response grounded in how owners like you actually handled it.