I would highly recommend you DON'T embark on this advanced lip buzzing technique until AFTER you have completed:
1. Beginning Lip Buzzing
2. Intermediate Lip Buzzing
3. Advanced Lip Buzzing
Now, if you have completed the above tutorials with success, then proceed and expect more strength to ensue by learning 2 no air lip buzzing techniques!
They are crazy hard, but you will be glad you put in the effort.
5 minute video tutorial