When you are shopping around for a mortgage, don't wait too long for the market to change -- lock in that low rate as soon as possible. If you get greedy and wait too long, you may lose out on a full percentage point of savings or more. By using a mortgage amortization calculator, you'll see what this means to you over the length of your loan. If you've developed a trusted relationship with a mortgage broker, follow their advice. They want you to get the best deal possible so you'll come back to them in the future.