Ask virtually any preacher and they will tell you: the most difficult sermons are those on biblical passages that are most familiar. Easter sermons. Christmas sermons. Prodigal Son sermons. Ask any bible reader and there are sections of Scripture that we find difficult to stay jazzed about studying or reading.
How do you view the Old Testament? If you grew up in Churches of Christ, you likely grew up in a Bible-oriented church. You probably learned the great stories of the Old Testament as a child only to be told, as you got older, they were interesting but altogether non-authoritative.