"It makes your offer more attractive to sellers," said Jeff Lyons, general manager of RealEstate.com a Charlotte, NC-based subsidiary of LendingTree, LLC.

"A thousand and one little things go a long way toward ensuring the client has a good experience," said Bill Emerson, Livonia, MI-based Quicken Loans' CEO and co-author one of eight co-authors of the new "Homebuying By The Experts" (Quantum Leaves Publishing, $14.95).

"Despite our efforts to simplify the mortgage process, it is still a very complicated process," said Emerson.

Lyons advises, "Make sure that you get a Good Faith Estimate of your closing costs to ensure that you understand everything that will be paid at closing. This document will also be a great reference when closing arrives to make sure everything is as it should be."

"Do not be afraid to read the closing documents and statements carefully. Whether buying or selling, you've got a lot on the line with these documents and want to make sure that the figures are correct and as agreed," said Lyons

"A lack of communication is the number one reason deals fall apart based on 15 years in the business," says Rob McCarthy a senior mortgage planner with American Family Funding in Campbell, CA.

"An agent fails to let the lender know there is Section I work to be completed. The client fails to tell the lender they just got laid off. A large percentage of the down payment is a gift that has not been seasoned for 60 days. All of these can be resolved as long as everyone is communicating and not making assumptions that everything will be okay," said McCarthy.