As former JW's we rarely used the term 'grace'. We usually spoke about God's 'undeserved kindness', or 'God's kindness'.
We knew what the Bible said about God's love and eternal life being a free gift but believed much more is expected of us in these last days before armageddon.
One of the reasons for unhappiness in the Jehovah Witness faith is that no matter how hard you work for the organization, your salvation is never certain. You must remain faithful to the organization until armageddon comes. Watchtower Sept 1989
Even if you do this, there is still doubt about being worthy of everlasting life. What if you could have done more for Jehovah but didn't? What if you secretly broke some rules required by 'God's organization'? What if you didn't trust the organization completely? What if you didn't do enough for God?
The Bible says that eternal life is a free gift paid for with the blood of Christ. What we need for eternal life is faith in Jesus, not the law. The Bible says that the law is a curse. Galations 2:21 - 3:29; Romans 6:23
As Jehovah's Witnesses we knew the truth, but couldn't accept that eternal life didn't come with any strings attached. Certainly it couldn't be that easy. That's why we worked so hard. Romans 6:23; John 5:24; John 3:15,16; We believed that much more is required than merely following Jesus. We believed that 'faith without works is dead' and we interpreted 'works' to mean working for the Watchtower organization because we believed it was 'God's organization'. James 2:14-26
Yes the Bible says we should be examples of the unconditional love Jesus had for all of us. Simply calling upon the name of Jesus and continuing to do whatever we want to do, is probably not the same thing as 'following Jesus'. We should do good works and love our neighbors. But to Jehovah's Witnesses 'good works' means submitting to the leadership of God's channel of communication.
That's why JW's work for the free gift God gave us. Attending meetings, going door to door preaching, giving talks, preparing for meetings, ... etc. is expected. In other words they serve the Watchtower organization by donating their time, energy, and money. When does a person know if they've done enough for Jehovah? Who will Jehovah save? Some feel guilty because they know they could have done more and didn't.