Should I sell flip property on my own or get a realtor?

I have previously bought a yet to be constructed property earlier this year. It will be completed mid next year. I want to flip it for profit- but unsure if I want to try selling on my own or get a realtor. If I get a realtor she may take a huge bite out of my proceeds. Considering the place will be brand new and in an up and coming area- I figuered it would be relatively less painful to do so on my own- thoughts??