Quite afraid the Dukoff D8 will be not a right choice for the moment. The tips Milandro gave are very important, so I repeat again :
- take in more mouthpiece
- keep a relaxed embouchure (exercise in front of a mirror if necessary)
- wait with buying a bigger mouthpiece (OK, I admit, I didn't, but I know how painful it actually is and how many bad habits you have to unlearn afterwards)
- if possible, go for a teacher and ask him to help
And I add one more : practice, practice, practice. Did I mention "practice" already?
- take in more mouthpiece
- keep a relaxed embouchure (exercise in front of a mirror if necessary)
- wait with buying a bigger mouthpiece (OK, I admit, I didn't, but I know how painful it actually is and how many bad habits you have to unlearn afterwards)
- if possible, go for a teacher and ask him to help
And I add one more : practice, practice, practice. Did I mention "practice" already?