My answer, when I ask myself those questions is:
I do the best that I can do -- to do the best that I can do -- and that's all that I can do.
And, then I try to accept that, do that, let it go, and keep on moving on.
For me... it's "Give it my best efforts to at least try, and to make my best effort ... to trust God, clean house, and help others, and follow the directions that I find -- when I find them."
It helps me to remember -- (but not use it as an excuse) -- that I can't even do that, without God's help. So, I try the best I can. Sometimes I make it. Most times I screw up. I accept it and keep on moving on.