I have a great idea!! need help on improving writing skills!!?

Hi! I have been at my fantasy novel series for almost a year and a half now, and I feel myself suffering from the same doubts. I consider myself to have an excellent imagination, but I sometimes feel that I have a hard time putting things on the page. I guess I have one real piece of advice here: practice. Yes, I know, that sounds like an easy answer, but let me explain. Earlier this year, I wrote a fifty page short story that I consider to be the last major writing project I have done. In the beginning, I had a hard time writing the scenes, but kept it going because my idea was brilliant. Towards the end, the words were literally flowing onto the page. All it really takes is time to find your rhythm. Yes, there are hundreds of books and websites that promise to make you a better writer, but quite frankly, none of them work. They are chock full of little tips like, use strong verbs, show don't tell, short writing is good writing etc. At times, they contradict. One book might say 'describe your character by accident, have him look into the mirror and describe what he sees' while another says 'the method of a character describing himself in the mirror is extremely amateur and borders on ridiculous.' No one can teach you how to write, because your style can only be found by yourself. Just channel your inner muse, practice, practice, practice, and you will finally find something you are happy with. Best of luck!