Not hard at all with the site sponsor. I put my information in their online tool and it gave me a number, higher than what similar contracts were going for. After that, I filled out their online form for listing. I think it was listed a couple days later and I had a buyer about 2 weeks later.
Andy was my contact for the listing and another agent sold it. They were both wonderful to work with. I did check a second agency for what they recommended my list price to be and it was lower than what I sold my contract for. The second agency was pushier, too, but it wasn't bad. It just wasn't nearly as good as the site sponsor.