let sleeping dogs lie
to leave a situation alone so that you don't make it worse
on the ball
organised, efficient and up-to-date
the ball is in your court
the decision or choice is up to them
to throw in the towel
giving up or accepting defeat
get my ducks in a row
to organise and get everything in order
cost an arm and a leg
when something costs a lot of money
hit the ground running
when someone starts working with energy and enthusiasm
hang in there
to not give up
pull out all the stops
to do whatever it takes to get the job done