If some step of a process which you expect to repeat can be automated, automate it, even if this takes ten times longer than just doing it "by hand."
When consistently applied over a long period of time, you eventually end up with webs of interlocking automatic steps which allow you to not only do the impossible, but iterate on the impossible a couple of times to make it look cleaner.
I'm not as smart as I like to think I am. Knowing that, I've gotten into a habit of trying to work out as many general principles as I can ahead of time, so that when I actually need to think of something, I've already done as much of the work as I can.
What are your most useful cached thoughts?
A few of the rules-of-thumb I've already pre-cached include:
That should be a reasonable but not overwhelming sample of the sorts of ideas I mean, and am hoping to evoke more of with this post.