1. Stock tires will work, just not as good as paddles. How many people will be in your machine? If you and 1 passenger, do 8psi rear 10 front. If 4 do 10 rear 12 front. Having 2 psi more In the front will help engage 4wd. And you need to be in 4wd.
2. Use 4wd.
3. Use 4wd. Don't ever stop pointing uphill, or sideways. Only pointing down. If you are side hilling, or going around a bowl, or transitioning... don't slow down to much, you'll roll. When in doubt, throttle out very much applies.
4. Obviously transition parallel to the dune. Turn into it, and just let it transition over. Trust your machine. Don't turn your wheel back into the dune once you transition, you will roll. Just keep rolling straight along the top or turn down.
The gas is your friend. If your ass end starts sliding out because you're going to slow around a bowl or whatever, push the skinny pedal. It will straighten you out. Don't slow down to much while transitioning, you'll roll. Use the gas.
Like I said, when in doubt..throttle out.
Don't buy them right away. If you are a frequent duner and know you'll be coming back quite a bit, yes, paddles make a huge huge difference.
Feel free to PM me if you have any specific questions. I'll try to help you out the best I can.