I still practice in the back yard. I work on hitting targets and keeping my bait low for a quiet landing. I practice with the weight and line I'm planning on using.
If you are having a hard time, lighter line and a heavier weight will make it easier. But, before you go out on the water, practice with that you plan on using.
Baitcaster can drive a newbie crazy, but once you get the hang of it you'll never want a spinning reel again.