There is no substitution for time and the experiences gathered during it.
Anthony Robbins said "If you want to be successful, find someone who has achieved the results you want, copy what they do and you'll achieve the same results." which is fantastic advice. There is something to bear in mind, though - even successful people can get it wrong sometimes!
With that in mind, here are my personal suggestions for 'ten things to let go of to enhance your speaking career' - and I really do speak from experience!