We had some work done on our patio and in the process our lawn got destroyed by a bobcat. The contractor laid down a fescue grass mix which is very nasty and does not match our previously bluegrass lawn. We are waiting until Sept to reseed the lawn using a renovator, that is, after killing the mis-seeded lawn. Any warnings or suggestions before proceeding with this? Frankly I don't trust my contractor to fix his job correctly so any advice would be helpful!