In case you don't know it there is a Lawn forum here for all such questions. You will likely get much more relevent info there as lawns aren't the focus of this forum.

Dave

PS: when you post there you really need to include your location or at least your growing zone.

In case you don't know grass is a plant and this area of the forum is about growing from seed.

Joel

Whoa, just trying to get you the best help. I note you are new to the forums and many don't realize that there are hundreds of different topic-specific forums.

Just a quick browse of this forum reveals the discussion focus is indoor growing; flowers and vegetable transplants from seed. While the Lawn forum focuses on grass growing and it's associated needs and problems.

But you are free to post it where ever you wish of course.

Dave

Unfortunately you have to plant the same grass most grasses will not take over another. I just redid my lawn ripping out all of the saint augastine. It depends on your area and what time grass you have. Where are you located and temperature. If temparture is above 70 then you could easily reseed yard and rake in.