I pay to have my yard sprayed 4 times a year. That keeps the majority of the weeds in check. I don't let them fertilize because it is so easy to do myself and I don't want a lot of fertilizer put down. Jut enough to keep it growing for a once a week mowing.
The guy two doors down has the best lawn in the neighborhood. He fertilizes like crazy and mows every 3 or 4 days. He does not have a sprinkler system so he is out moving the sprinkler every other day.
I may well do a first mowing this weekend.