Do you want to be good at something? How about really good? Then you need to practise. Any skill takes work. To assist you, try to get feedback and support from other people on a regular basis. Also, try to conduct frequent self-evaluations so you can think about how you can improve. It is all very well practising the same thing over and over (that song you really like playing on the guitar), but to become an expert you will need to step out of your comfort zone and tackle the trickier things. Remember to enjoy yourself along the way, of course.