Kinda lost...

Me and my brother inherited our parents house and have been living here. He is on a disability, and I have health problems that have made affording to live here tough. We were thinking of downsizing, but were unsure of how. Do you sell the house first, then buy another? That seems tough if neither of us have a lot of cash for short term housing and storage of our stuff. If we put up the house, and buy another, and then the market crashes because of the doofus in the USA's tariffs, then we would be screwed. Ive never bought or sold a property before, so I dont really know anything about the process. Just wondering what the best way forward would be. Any advice would be appreciated.