God's grace is God's unmerited favour and mercy, it is also God's power. 
We are saved by grace but we also live by grace through faith. 

God's grace is given to us freely, we don't need to work for it , God gives it to us. All we need to do is ask for it.

God gives us grace to go through difficult situations, the grace to have courage, the grace to have strength, the grace to make relationships, the grace to step in new directions and more.

Grace is the holy spirit's power flowing through us... when we try to change ourselves we are relying on out own power or self will and we are likely to fail. 
When we pray and ask for Gods grace , God gives us the power to change as he is doing it within us , it is through his power, by our faith in God.

 " But he gives us more and more grace ( power of the Holy Spirit, to meet this evil tendency and all others fully ). That is why he says, God sets himself against the proud and haughty, but gives grace ( continually ), to the lowly ( those who are humble enough to receive it). "
James 4:6

" For it is by free grace ( Gods unmerited favour) that you are saved.. through faith. And this is not of yourselves ( of your own doing, it came not through your own striving.), but it is the gift of God. "
Taken from Ephesians 2:8