1."Hope for the best, but prepare for the worst."
This seems pretty clear.
2."Better late than never."
This one's clear, too.
3."If you want something done right, you have to do it yourself."
Don't trust other people to do important things for you. You have to do things yourself to control the quality of the results.
4."Don't count your chickens before they hatch."
Your plans might not work out, so don't start thinking about what you'll do after you succeed. Wait until you've already succeeded, and the

