My turn!

I enjoy reading productivity blogs. Mark Shead at Productivity 501 asked 30 of the best productivity bloggers three compelling questions, and compiled their excellent answers.
Now, he has asked the rest of us to respond. Here are my answers:

What is the single biggest way people waste time without even realizing it?
Worry. Each day comes at us with a certain pace. We can plan; we can do our best; we can analyze our performance and plot our progress.
Worry - dreading what might come - is paralyzing and counterproductive.
I think of it as mental nail-biting. With my head down, nibbling on my nails, I can’t face the world.

What change has made the most difference in making you effective in life?
Eschewing perfectionism. My father-in-law often repeats the following two aphorisms:

"Don't let an imperfect situation become an excuse to do nothing."
and"The Perfect is the enemy of the Good."

I have to remind myself before, during, and after an undertaking, that no human is perfect. Attempting perfection is hubris. I tell my kids (and myself) not to aim for perfection, as only G-d is perfect. Aim for excellence instead.

If someone were to read just one post from your site, which would you recommend the read and why?
I'd choose "Simcha Blisters" because it demonstrates the practical application of the answers to the above two questions.