How do you get a cashiers check for making a large payment?

Go to a bank where you already have a banking relationship. Then ask the teller that you need to get a cashiers check issued. Normally a cashiers check will be preprinted with the 'Payable to' filled in, so you need to know who to make the check out to. They will deduct the amount from your bank account, so you need to have enough money in your account to cover it.