About the only thing I can say is tenacity is a real necessity. You cant learn to do anything worth a flip overnight, and writing is no different except by degree. Each work will be somewhat better. And finally, there is a point at which you take off. Any analogy works, but remember when learning to ski you had to manage about fifty things at oncebalance, poles, stay on the inside edge, my God this is steep, keep your upper body quiet, etc.constantly concentrating on all of the minute aspects.
Writing is like that.
Only infinitely harder. A million points and tools exist for you to master and remember. And you will. And one day youll look up and say, My God, Im writing. Just take this a step at a time.