Run the business, right up to the closing, as if it will be yours indefinitely. It might be. Decisions made in anticipation of a closing can be costly. Invest in audited financial statements. Audited financial statements make you more nimble.
Higher confidence equals higher price.
Understand the financing. Before signing anything, know the buyer's financing plans. Know the sources of equity, bank debt, or subordinated debt. You should know, but you won't be told unless you ask. Remain on guard.