friend trying to rip me off .......

I have done major projects for friends, in the hundreds of thousands of dollars. Here are my rules. This is how much, this is when I start, this is when I finish, this is how you pay me, do not change the plan and expect it to be for free, and don't ask questions or bother me at all until I'm done. My part? Do exactly what you say you want done. If you can't or will not abide call someone else. We can stay friends and go fishing while someone else busts their ***.