A method that works for one doesn't necessarily work for another. Incorporate it into your practice routine and see if it works for you is all you can do. In trumpet playing as with life, there isn't any shortcuts most of the time. Last year at this time I was having problems reaching the 2nd octive f (sorry don't know the proper terminology) and today due to just playing and practicing I play it without a problem. There are enough good songs to play that don't need you to play high.