even Homer nods, it's a good horse that never stumbles

the first step is always the hardest

(idiomatic) there's more than one way to skin a cat

in for a penny, in for a pound

One must let sleeping dogs lie

One must strike while the iron is hot

there's many a slip twixt cup and lip

slow and steady wins the race; more haste, less speed

two heads are better than one

something is rotten in the state of Denmark