przechodzić przez uciążliwe formalności

pull strings

learn the hard way

a spanner in the works

bend over backwards

burn bridges

burn the candle at both ends

Let's not sweep this under the carpet; the unresolved problem will return at the next settlement.

I didn't want to act on my own initiative, so before contacting the client I checked who was handling the matter.

Let's not cling to the plan if the condition on which we based it no longer holds.

Let us not count our chickens before they hatch; the room is available, but the owner has not confirmed the booking yet.

That further change of date was the last straw; we asked for a fixed schedule.

Let us not put all our eggs in one basket; let us prepare a second meeting venue in case the room is unavailable.