In part one of how to throw a cast net I posted 2 videos of the best methods I have found, but during my daily youtube wanderings I actually found some other methods that you might like to give a go. They are all worth trying out and if you want to practice I would recommend doing the following:
1. Make sure you are feeling really calm
2. Watch one video noting the key points of the instruction and write them down!
3. Find a grassy space with plenty of room for swinging and throwing
4. Practice following the technique you have chosen remembering all the key points.
5. Don't give up on one technique too quickly - it takes some time. If you really cant get it try another technique
6. Write down every revelation you have when your casts are getting better so you don't forget what you did differently.
7. When you get it right make sure you can replicate the results over and over.
Good luck with your cast net throwing and I hope you have an easier experience learning than I did!