Don’t bite off more than you can chew.

Don’t upset the apple-cart.

Don’t change horses in midstream.

Don’t waste too many stones on one bird.

Don’t count your chickens before they are hatched.

Don’t whiz on the electric fence.

Don’t cross the bridge till you come to it.

When a cowboy has a chew in his cheek, don’t slap him on the back.

Don’t guild the lily.

Don’t interfere with something that ain’t bothering you none.