Replying to Visiting whistler

Came out west today and today was my first time ever skiing pow... Damn is it ever hard. I was skiing on salomon shouns today (99mm waist) and was doing alright but felt like it took a lob of effort t bot tip dive and fall. Is it just because this is my first time and I'm not using then right technique or do u guys think I would do better on fatter skis? If I'd be better off on fatter skis, where should I demo/rent some?

Thanks!