Being able to sell your existing home first is generally the least stressful because there’s less risk. You’ll know exactly how money is being netted from the sale of your home. WhatYouNeedtoKnow About SellingaHouse That’s Underwater. There are multiple aspects youneedtoknow about sellingahouse that’s underwater in Wisconsin or elsewhere. The pros and cons of selling first. When yousell your home before buying a new one, youknow how much money you have to work with. It’s also easier to get a new mortgage when you’ve sold your old home. You won’t have two mortgage payments holding you back. Move smoothly without double mortgages with Opendoor* Buying and selling homes at the same time doesn't have to mean juggling uncertainty or risking financial strain. Buying ahouse can take as long as five months, and selling can take as long as six. It's important therefore, toknow all the steps involved so you can make the move as quick as possible. Estimate your mortgage payment. See current mortgage rates. Learn about financing a home.Recommendations are based on your location and search activity, such as the homes you've viewed and saved and the filters you've used. View rates, learn about mortgage types and use mortgage calculators to help find the loan right for you.