Dude you're probably gonna get owned. How old are you? I started when I was like 13... which is a good thing because you can take a pounding when you're young.
It's going to be difficult to do in one day, and likely be extremely frustrating. I'd say take a lesson but if this is only a one time thing I guess it doesn't matter.
I'd probably just go skiing instead.
The thing with turning is not to just pivot your board, but to lean up on your toes and heels. Picture your board going straight do a hill. Now you want to take a left turn to slow down. You mostly use your back foot to push down the slope, turning your board closer to perpendicular to the hill rather than parallel. But if you only do that, you're going to catch your toe edge and hit hard (just use your hands to move the board on your carpet to picture how this will happen). At the same time you bring the board away from parallel to the hill, lean on your heels so your toe edge comes completely off the slope.
Here's an exaggerated horribly done paint diagram:
The same thing with a toe side turn. If you don't lean forward on your toes up the hill, your heel edge is going to catch and you're going to go flying backwards. Honestly you're better off leaning way forward on your toes and slowing down so much you fall forward up the hill, than catching an edge and going flying.