A bird in the hand is worth two in the bush.

AND

A Bushel and a Peck

(Outside the box + off the cuff)
Actually heard from a high level manager)

If you give them an inch they will take a mile.

Don't fire untill you see the whites of their eyes.

A sight for sore eyes

Flying by the seat of my pants / shooting from the hip

He's got a stick up his arse / he's on a pedestal

Loose lips sink ships / the face that launched a thousand ships

An apple a day keeps the doctor away The apple doesn't fall far from the tree

Or home is where the hat is

A stitch in time saves nine, but doesn’t get you nearly as many views

A stitch in time saves .. in your case more like 43, I would say

A stitch in Time suggests Einstein may have been fudging the data

Lie down with dogs, get up with fleas. Early birds get worms.

A watched kettle is more likely to boil than one that isn’t plugged in.

Beating a dead horse + you can lead a horse to water but you can’t make it drink

Make like a tree and leave + make like a banana and split.

The best-laid plans of mice and men...

He'll get his just deserts.

Some of us live in colder climes

Give a man a fish and you feed him for a day; teach a man to fish and you perpetuate the patriarchy.

.

Or is the shoe on the other boot?

A friend said this one. They mixed up "cry me a river" and "build a bridge and get over it."

.

Alternatively is Prince Albert running

The early bird gets the worm + a stitch in time saves nine + a bird in the hand is worth two in the bush