Can someone give me an idea of what is involved in dethatching and how much time I should figure it will take for an avg 1/4 acre home? I'm going to rent a dethatcher from sunbelt probably like the honda 5.5 hp 18in width. Do I use this and then will I need to run over it with the mower and bag it or what is the best way. I'm figuring they'll charge me about $20-30 to use the dethatcher for like 1/2 day ( since a commercial 21 inch mower there is like $15 for a 1/2 day). The lawn is about 20% dead I'd say, the rest is still growing. So with this in mind what do I do...do I just go over the obvious yellow/gray spots or do I go over the spots that aren't so bad too? Is this a 2 hour job or 4 or? I need to get a price quote for this lady cause it's not raining and I'm really hurtin 4 cash, as I'm sure many others are in this line of work!