You soon find when you embark on a treatment such as laser hair removal that you are bombarded with advice. Your practitioner has got everything wrong it seems, all your hairs are going to go white, you'll end up with an interesting pattern of indelible red marks on your face, it'll take far more treatments than necessary if you do it that way. And many more permutations of that theme.
There's an important thing to remember when faced with such a confusing array of views.
Number of procedures of which the person offering advice has experience: ONE.
Number of procedures of which your laser practitioner has experience: MANY THOUSANDS.