Good afternoon! I spent time with several other clients this weekend, working with them on this very issue. From your zip code, I think you may be in Montgomery County, with thoughts of buying in Highland. So, you need to get a market analysis on your Montgomery County property, and then -- with your agent -- set up an asking price for that house that makes it appeal to the mot buyers possible without 'leaving money on the table.' Meanwhile -- preferably with the same agent since quite a few of us work in both counties -- you look for houses in Highland that you like. You can put an offer in on a house, contingent on selling and settling your existing house. The sellers will evaluate that risk, along with the other terms of the contract you are offering, to decide if they want to wait for your house to sell. Some sellers will agree; some won't.
The key word in your question was 'plan' -- it takes planning and strategizing to make this work, but it can as long as everyone involves understands the process, and respects each other!