If we can get beyond being set in our own ways, we can mature quite a bit.

Part of being mature is being thankful we can be mature.

Addressing difficulties positively, is clearly evident when we accept those difficulties as part of our giving ...not giving in to what is wrong, but giving our services when it's often difficult. The Bible says that God loves a cheerful giver.

Cheerful or not, the biggest part is following God's guidelines. To accept God is to follow Him, and that includes following His guidelines and what He has said. 

And following does not mean always doing without fail, nor does it mean doing without mumbling ...as is clear in the parable Jesus told in the Gospel according to Matthew (21:28-31). Though we should attempt to not fail, we should certainly not justify our failures ...claiming, as we often do, that those things are not wrong.  And to minimize the mumbling would also be good.