Replying to Binding DIN self-Adjustment

I searched an couldn't find anything on adjusting DIN yourself...i remember seeing something not long ago but couldnt find it.

Anyway, I am due to go to japan for a ski trip in Feb. The last time I skied was in June. Since then I have become heavier and now weigh 79kg. I was about 74-75 in june. I'm thinking of increasing my DIN from 7 to about 8 or 9.

My question is, is it crucial that a tech handles DIN adjustments? Can I do it since it's only 1 or 2 increase?

Bindings are Look Pivot 14.

Help appreciated