Kiara sky only lasting 3 days

Hello all! Newbie here! I've been trying to do my own dip nails. I read Kiara Sky is one of the best so I got the kit etc. And I know that I'm probably just not prepping my nails good enough, but any tips/tricks to get them to last longer?

My other problem (I think) is my nails are EXTREMELY thin and soft (from years of wearing nail polish etc on them, and probably also ripping nails off when I shouldn't).

Any advice that the video tutorials don't show?