Before you go shopping in person, go online to major manufacturer websites to become an educated consumer. Print out the pages that describe five to seven models. Locate retailers and showrooms that have the exact models you want to try.
Test out the mattress inside of the retail showroom. Yes, that means sitting and lying on it and in all of your favorite sleeping positions. Wear comfortable pants and removable shoes so you can really test every mattress you're considering. Try the mattress while lying on your back, side and stomach.
Become your own product reviewer, and rate each mattress on a scale of one to five, with one being poor and five being excellent. Narrow your selection down to your top three. Compare your ratings along with your research to make a confident final purchasing decision.
Resist the temptation to buy a mattress from one manufacturer and a box spring from another to save money. Mattresses and box springs are designed to work together as a unit. Always negotiate the listed price and return policies.