The advice above isn't good at all. Rich is bad and lean is worse. Right is good. Did you not learn engine tuning before flying your plane for the first time? The best way to learn tuning is to have someone show it to you, preferably an experienced flyer from your club. A distant second is to use the search button and read the myriad of posts on the topic. I will tell you that the needle valve settings should be fairly simple to get right and the changes they make predictable and repeatable. If the engine is erratic, you have a fuel supply problem or an air leak to fix first.