If you can't do something just right, don't do it at all.
A recent example from my life: Our downstairs neighbors hosted a farewell-for-the-summer/Mother's Day brunch, this past Sunday. The food was extensive and delicious, the company delightful. I wanted to be sure they understood how much I enjoyed the whole affair and appreciated all their efforts, so I decided a thank you email wouldn't be enough, it had to be a hand-written thank you card. But, of course, our cards are packed away somewhere, and the days have been passing without my taking the time to find them or remembering to buy a card. In the meanwhile, I got an email from one of these lovely neighbors with the recipe I requested. But how can I answer it? It would look like I couldn't be bothered to say thank you for the brunch until I had to email for other reasons. So now, that email sits unacknowledged, and I look unresponsive in addition to ungrateful, a whole new color of Highly Ineffective.