A: Congratulations, you've achieved the ultimate in envelope labeling mediocrity! Simply rip off the label, reapply it, and hope your coworker doesn't notice the 17 consecutive errors.
Or, you know, just send it via carrier pigeon. They won't judge you.
A: Ah, the classic "I'm a functional adult, but my brain has a 5-year-old's logic" conundrum! In this case, just wing it and hope your recipient has a sense of humor about receiving a 2nd-grade art project.