List before hiring a real estate agent?

[Anna Smith]

My husband and I are nearly finished with our flip.  We are thinking of listing it for sale by owner as we finish the last details.  We plan to use  a real estate agent once we are finished.  The interior is finished, we just need to add some landscaping, and power wash the driveway.  Can you see any negative to listing it on Zillow ourselves before we list with an agent?