Think you need to come up with 20% for a down payment in order to buy a house? It might surprise you to know that the median down payment for first-time buyers last year was just 7%, per the National Association of Realtors®. And there are plenty of loan programs out there that require far less. The 20% myth is just one of the things that's keeping homeownership out of reach. We're digging in to seven others. You need to be well-established in your foreve…