I'll do it myself FSBO
Some things to consider:
1. Unqualified Buyers.
Used to be if you could fog a mirror you could get a loan. Times have changed. FHA, agency and conventional loans all require full documentation of income. Finding a buyer is easy, finding a qualified non contingent buyer is work. Do you have the time to meet with potential buyers and the means to pre-qualify them before you show them your home? It is easy to spend lots of time showing your house to people who are unable financially to afford it.
2. Bargain Hunters/Realtors.
Some people are excellent negotiators and know real-estate pricing. Inexperience can be costly. If you ever want to meet a realtor just put up a "For Sale by Owner" sign in your yard! A realtor should be referred. Phone a friend, ask a co-worker or a family member, but don't just pick one off your front porch.
3. Emotions
Coupling one person selling their biggest asset and another making the largest purchase of their life can create some emotion. Having a third party professional handling the negotiations, escrow and paperwork will calm much of this emotion.
4. Pricing
Sometimes sellers mistakenly price their house higher, knowing they can lower it latter or base the price on what they would like to get rather than on market value. Market value determines price, not wishful thinking. Remember, every sale must be asked for. Knowing when to close and how to Seal The Deal is vital for all transactions
