How Can I Evaluate Whether I’m Doing Enough for the Lord?

Questions about how to evaluate whether you are “doing enough for the Lord,” whether Ezekiel 3:18 indicates you will be in trouble on judgment day if you didn’t tell someone the gospel before they died, and whether it’s okay for a Christian to use Latter-day Saint resources to do family research.

• What advice would you give me as an average believer to evaluate whether I am doing enough for the Lord and serving him enough?
• Since God tells Ezekiel in Ezekiel 3:18 that if he doesn’t warn people, and they die in their sin, their blood will be on his hands, does that mean I’ll be in trouble on judgment day because someone I used to help died in a fight before I could talk to him about Christ?
• Is it okay for a Christian to use Latter-day Saint (Mormon) resources to do family research, or would he be opening himself up to LDS theology by spending time there?