Just building on what Tiago suggests, the Stack Exchange platform encourages people to answer their own questions, and I really think it could be helpful to have the occasional self-answered question to help build our repository of useful Q&A knowledge. But it's important to remember the Q&A part! Self answered posts should look just like any other thread on PMSE.
In short, Self Answerers Must Role Play:
For example, when self-answering, it's helpful to think of yourself as two people: jmort253(1) and jmort253(2). jmort253(1) has the question and posts it, including what problem he faced, what research he did, what alternatives he considered.... jmort253(1) should write the question from the perspective of someone who is having a problem and who simply cannot find the solution. In fact, in his role, he knows of no answer.
jmort253(2) on the other hand, sees the predicament jmort253(1) is in and answers the question, following all of the guidelines of "How to Answer", including ... explanations and maybe supplementing the answer with a link.
Additionally, a third party coming to this page should not know that the question was self-answered. Imagine if usernames were hidden on all posts and everything was posted by Anonymous. There should be nothing in either question or answer that suggests it's self-answered or that something is amiss.
This is the true meaning of "pretend you're on Jeopardy".
I edited out Stack Overflow references to code, which doesn't apply here.
So, just like any other question, there should ideally be some problem to be solved, and if you recently faced a tough project management challenge and wish to document the result, a question clearly describing your problem followed by a great answer would be awesome! Remember, don't break the fourth wall! :)
For more reading, see: