Last night we had a great discussion on sharing the gospel with those who feel they are righteous or who are trying to achieve righteousness through their good works. A good approach is what Jesus modeled for us with the rich young ruler. We need to "load the truck" with the whole moral law of God so that they can feel the enormous weight of the burden they are trying to carry. When they realize they can't do it, then they are in a position to hear the gospel.
If you can come on Wednesdays, it is a great time of fellowship and learning in Christ!