Replying to Changing your own din?

Hi, I was just wondering if it would be a bad idea to change my din from like a 4 to a 6 or so on my old little skis.

I used them when i was like 5'5 100lbs, I'm now 5'10 130lbs...

Gonna be using them on a little skate rail setup in my front yard i made w/ surplus snow.

Is it ok to do it yourself and not get it pressure checked w/e the other shit is they do at the shops or is it unsafe?