If you want to be sure you got things covered, how about a soil test? I do not like to apply anything without that in my hands. One of my clients has a 1/2 acre bermuda lawn. She told me how she once spread a double or triple rate of granular lawn fertilizer. For all of that work and money, lawn greened up a little lasting all of about a month where it should have been growing like crazy for the next 90 days. I started servicing the lawn. First visit was to draw soil samples. I found a pH of almost 8 and excessive magnesium. That is why the fertilizer did not work. Now, I treat the lawn with an ammonium sulfate and acid based fertilizer mix. Lawn now needs mowing twice a week.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738