If you feel that you are being pressured into a mortgage that is more than you want or that will be cost prohibitive for you to make the monthly payments it is important to simply let the mortgage company know your limits and stick with them. If you are pressured after this it is best to find another company that will work with your comfort level rather than trying to push you into something you don't want or can't afford.
Home mortgage services should be obtained before you go looking for your dream home. When you do this, you are able to choose the right home based on the amount of money you can afford through the mortgage that you get. Many may be shocked at what they can afford!