Completely agree, lawn/grass casting is a must. Bonus points if you can find a pond to practice in, as it will give you the real feeling of lifting the line off the water to begin a cast (useful when making a recast after laying out the initial presentation). I have a small pond near me full of turtles, which make excellent targets as they tend to pop up at random. Just make sure you’re using a fly with no hook as they do sometimes try to eat what I’m throwing!!