We used a company. My husband and I built our own pool 4 years ago. I would not recommend it. We did that. What a nightmare I tell you. The pool was a little crooked, you could tell by the waterline, it had water problems under the liner, the bottom wasnt too smooth, you name it.
The company we used was Fun-n-Sun Recreation.
The concrete is Sun Buff with Desert Tan in the Ashler Slate pattern. Our liner is Medevil Tile Mist.