choosing the right practitioner is the most important thing you have to do to get good results.
its best to choose a doctor who performs it rather than a technician. check for credentials and and certificates, and if he has a member of an association related to laser hair removal,the better.
since every member is required to attend seminars,most likely he is updated with the latest technology and updates concerning laser hair removal.
and lastly check also for feedback and comments from his previous patients.