Get Pre-Approved (Pre-approval letter), or Proof of funds from an accredited financial institution on company letter head.
Based on what type of loan your awarded, determines what percentage of a down payment you are required to put down (have it available in an account). Down payment is usually due at initial signing of contract.
Met with desired professional to go over all your costs that will be associated with the purchase of your property. Know what you can and cannot afford and stick to it!!!
Be realistic on what your budget is and view properties in your price range and taste. Do not explore options that does not suit your needs!!
Real Estate Agent
Choose one that can walk you through each step to alleviate any concerns and doubt you might have. A good agent will make you feel as if the process was just seamless and straight forward.