The only difference is in advertising. Not using a realtor, your property will not be exposed to the Multi-Listing-Service available through a license agent. Hence, you will need to advertise your property yourself.
First go to the bank and ask them for help. They can tell you what questions to ask. Next stage the house and have open houses. Print material that explain the house. See samples of realtor listing on the internet.
A person selling their home as for sale by owner must market the house by putting a sign in the yard and placing ads in the paper. Buying a home without a realtor through a FSBO eliminates the commission cost. Use a title company to keep everything legitimate and legal.