My dearest friend Kent often talks about how we can evaluate ourselves to death and determine all the things we need to do better at. But unless we're doing that by the Spirit, it's really not very helpful. God is the judge of our hearts, and if we ask Him what we're working on, He will tell us. Often it's not always what we think, but it is the best thing.
My ever lovin' Beth just wrote a post on a similar idea, which I highly recommend. It has a very awesome chalk drawing in it.