Don't cross the bridges before you come to them.

Don't have thy cloak to make when it begins to rain.

Don't keep a dog and bark yourself.

Don't look a gift horse in the mouth.

Don't put all your eggs in one basket.

Don't sell the bear's skin before you've caught it.

Don't trouble trouble until trouble troubles you.

Don't whistle (halloo) until you are out of the wood.

Dot your i's and cross your t's.

Draw not your bow till your arrow is fixed.