As I was driving this morning I noticed a yard with grass about 14 inches tall. I left a flier and the home owner called and asked me to come and cut, weed, front and back. I'm a newbie. Right now I only have a self propel. This yard looks like it would be 40-45 for a regular cut. The owner said when you get there cut it, I'll pay you. I'm moving in today. With my self propel I have to hit it with the weed wacker first. How much should I charge?