Not being pre-approved
Pre-approval gives you power.  You know the amount that you can borrow, look at appropriate properties, and have negotiating clout with the seller.

The pre-approval process is very thorough. During this process, the mortgage company carefully reviews your income, assets, credit and other relevant information associated with obtaining full approval. Since property is not identified to purchase, an appraisal and title search aren’t conducted.

Making verbal (oral) agreements
If an agent tries to make you sign a written document that is contrary to their verbal commitments, don’t do it! For example, if the agent says the washer will come with the home, but the contract says it will not–the written contract will override the verbal contract. In fact, written contracts almost always override verbal contracts. When buying or selling real estate, abide by this maxim: Get it in writing!

Choosing a lender because they have the lowest rate
While rate is important, you have to consider the overall cost of your loan. Pay close attention to the APR, loan fees, discount and origination points. Some lenders include discount and origination points in their quoted points. Other lenders may only quote discount points, when in fact there is an additional origination point (or fraction of a point). This difference in the way points are sometime quoted is important to you. One lender will quote all points, while another lender may disclose an extra point, or fraction thereof, at a later time—an unwelcome surprise.

Not getting a written good-faith estimate
Within 3 working days after receipt of your completed loan application, your mortgage company is required to provide you with a written good-faith estimate of closing costs. The cost of the mortgage, however, shouldn’t be your only criteria. You must also feel comfortable that the loan officer you are dealing with is committed to your best interests and will deliver what they promise.

Your realtor is not a financial expert
He or she may not know which loan is best for you. Your realtor gets a commission only when your transaction closes. As a result, the realtor may refer you to a lender who will close your loan, but who may not have the best rates or fees. Although most realtors are professional and concerned about your best interests, you should do your own homework. There are countless stories of consumers who ended up paying higher rates, or got a loan that wasn’t right for them, because they blindly followed their realtor’s advice.

Using a dual agent (an agent who represents the buyer and seller in the same transaction)
Buyers and sellers have opposing interests. Sellers want to receive the highest price, buyers want to pay the lowest price. In most situations, dual agents cannot be fair to both buyer and seller. Since the seller usually pays the commission, the dual agent may negotiate harder for the seller than for the buyer. If you are a buyer, it is usually better to have your own agent represent you. The only time you should consider using a dual agent, is when you can get a price break (usually resulting from the dual agent lowering their commission). In that case, proceed cautiously and do your homework!

Buying a home without professional inspections
Don’t take the seller’s word that repairs have been made. Unless you’re buying a new home with warranties on most equipment, it is highly recommended that you get property, roof and termite inspections. These reports will give you a better picture of what you’re buying. Inspection reports are great negotiating tools when it comes to asking the seller to make repairs. If a professional home inspector states that certain repairs need to be made, the seller is more likely to agree to make them. If the seller agrees to make repairs, have your inspector verify the completed work prior to close of escrow. Do not assume that everything will be done as promised.

Not shopping for home insurance until you are ready to close
Start shopping for insurance as soon as you have an accepted offer. Many buyers wait until the last minute to get insurance and find they have no time left to shop around.

Signing documents without reading them
Do not sign documents in a hurry. As soon as possible, review the documents you’ll be signing at close of escrow–including a copy of all loan documents. This way, you can review them and get your questions answered in a timely manner. Do not expect to read all the documents during the closing. There is rarely enough time to do that.

Making moving plans that don’t work
You expect to move out of your current residence on Friday and into your new residence over the weekend. Also on Friday, your lease terminates and the movers are scheduled to appear. Friday morning arrives: bags packed, boxes stacked, children under arm and the dog on a leash; you’re sitting on your front door stoop awaiting the arrival of the movers. Your phone rings. Your loan closing is delayed until the following Tuesday. The new tenants turn into your driveway with a weighted-down U-Haul and the movers pull up across the street. You ask yourself, “Where’s the nearest Motel 6 and storage facility? How much will the movers charge for an extra trip? Can we afford it?” How can you avoid such a disaster? Cancel your lease and ask the movers to show up five to seven days after you anticipate closing your transaction. Consider the extra expense an insurance policy. You’re buying peace of mind-and protecting yourself from expensive delays.