I talked with my parents tonight. They gave me the bad news. You don't just till grass. Even if you cover it up, it will come back. They said I should dig it up first, then till the flower bed. That just seems like too much work. I don't have a machine that will do it for me! So I will try placing moving boxes (cardboard) over the grass. I'll soak the boxes with water. Hopefully I can kill the grass, then till it. I hope I can kill the grass in the next 2 or 3 weeks then till it under, and make my flower beds. I don't think I have the power to dig up large patches of grass.