Mistake #1 - Not Knowing What You Can Afford
As we've all learned from the subprime mortgage mess, what the bank says you can afford and what you know you can afford or are comfortable with paying are not necessarily the same. If you don't already have a budget, make a list of all your monthly expenses (excluding rent), including vehicle costs, student loan payments, credit card payments, groceries, health insurance, retirement savings and so on. Don't forget major expenses that only occur once a year, like any insurance premiums you pay annually or annual vacations. Subtract this total from your take-home pay and you'll know how much you can spend on your new home each month. When calculating this figure use a mortgage calculator to research current interest rates. This will give you an estimate of what your total mortgage payments will be.
If you end up looking at homes that are outside your price range, you'll end up lusting after something you can't afford, which can put you in the dangerous position of trying to stretch beyond your means financially or cause you to feel unsatisfied with what you actually can afford. You may even learn that you can't afford the type or size of home that you desire and that you need to work on reducing your monthly expenses and/or increasing your income before you even start looking. (Read Six Months To A Better Budget and Get Your Budget In Fighting Shape to learn more.)