A - Probably the most important things to do are the following:
Get a realistic idea of what you can afford. Do this by either sitting with your financial advisor (if you have one) or sitting with a representative of a reputable mortgage lender. I do not advise that you use an on-line mortgage company for your first home buying experience. Direct mortgage lenders and reputable mortgage brokers have their own sources of money and while some may tend to be a bit conservative in their lending practices, that conservatism will help keep you out of trouble too.