"know that it's his decision as to whether it's a yes or a no and you "won't" get angry or disappointed w/him. He needs to know that he..."
Also, you can phrase your question about help in another way. You can say "h, I need to some assistance w/the lawn work, do you know anyone who can do it for a reasonable fee"? He may offer up to do it and come across as the one doing a good deed.
Again, it all depends upon his mood.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.