Hmm. Maybe, can you think of any biases that would influence this problem? If no, go with intuition. This requires prerequisite knowledge and practice to be useful though.
Perhaps: if the outcome of a decision is not very important, go with your gut.
One offered in the article:
A rule of thumb in this direction is “Trust your gut reaction when dealing with natural tasks such as raising children.”
Maybe: when you think your answer is good enough, go with it. (So no double guessing yourself or thinking that to be a good rationalist, you should spend more time thinking things through)
This was linked to twice recently, once in a Rationality Quotes thread and once in the article about mindfulness meditation, and I thought it deserved its own article.
It's a transcript of a talk by Persi Diaconis, called "The problem of thinking too much". The general theme is more or less what you'd expect from the title: often our explicit models of things are wrong enough that trying to think them through rationally gives worse results than (e.g.) just guessing. There are some nice examples in it.