Many people in their thirties make the mistake of buying too much house, often driven by an idealized vision of homeownership. It's crucial to keep monthly payments within 25% of after-tax income and consider a 15-year fixed mortgage to avoid financial strain. With median home prices soaring, first-time buyers may need to adjust expectations regarding size or location, and saving for a larger down payment can provide more options. A free mortgage calculator is available to help determine what you can realistically afford.