One of the most common problems I've seen is that people give up too soon. For a sharp edge, you need to bring both sides down to meet. This might sound obvious but often it is overlooked. One way to do this is to sharpen one side only until you feel a bur along the entire length of the blade on the opposite side. Once you have that bur, then you sharpen the other side the same way. Finish by stropping but be carefull. If you have a very thin edge, you can roll the edge while stropping so watch for that. A 10x magnifying glass will help you check your progress.
. . . deliverance will not come from the rushing, noisy centres of civilization. It will come from the lonely places. - Fridtjof Nansen