How can we help other people deal with sin in their lives?

Dennis Gunderson explains in this video that it is helpful to not only address sin and repentance from the pulpit but to also build individual relationships with people in the congregation. Connecting with people on an individual basis will help those individuals to know how to combat sin.  

Sermons inform doctrine, but it is also important to not neglect the personal discipleship of others. It is vital that another person walk with others in the congregation, hold them accountable, be there to talk about particular struggles, and point them to Scripture.  

Hebrews 10:24-25 (NKJV) - "And let us consider one another in order to stir up love and good works, not forsaking the assembling of ourselves together, as is the manner of some, but exhorting one another, and so much the more as you see the Day approaching."  

Is there a danger in that we sometimes merely address the subject of repentance from the pulpit in our preaching and don't get down on the street level, if you will, with individuals and help them. I think there is a very crucial danger here. Many are not going to be assisted or equipped to know what it is to deal with their personal sins, merely from sermons. I've known so many people who have said, you know, that sermons have informed their doctrine and helped them grow in their understanding of God's word, but most of the time when it came to making serious personal changes in one's life, sermons may have helped, but time with some individual who really got into their life and spent one-on-one time invested with them is really what made the difference. Someone who could walk with them and show them as pertains to your specific struggles in the Christian life, Here is how I and others have fought that fight and how we've overcome in that area.

To be open with one another, not only for the purpose of genuine growth, with the help alongside of one another of people that have been in the battle that are enduring the same temptations and battles as Paul says no temptation has come to you but such as his common demands.