what I'd end up writing would be a concise set of instructions with some advice that seems most helpful to me.

I'd like to read that, in addition to the full guide. It would tell me which elements someone who's already practiced this finds especially important.

A place where people could report their personal difficulties and respond to each other might be better.

I'm not sure the two need to be mutually exclusive. An open thread in the discussion section might be good for this, since it wouldn't be of general interest to everyone on LW but the people who are interested could use a meeting point.