Always, in order to work on oneself, one has to take a good hard look at themselves and see what needs improvement. Don’t try and make too many changes too soon, or try to do too much too soon that will only be a recipe for failure. Think of something you would like to work on and then make an effort to do better in that area. When you feel better about that, it will help you to feel better about yourself in general and allow you to move up to another area.
So if for instance you want to make improvements in the area of loshon horah, concentrate on that for a while until you really have a handle on that before you choose to tackle another area. Make sure you feel good about your accomplishment and you are confident that you reached your goal, then you can happily move on to another.