If you don't lead a barrel now and then it means you aren't pushing the envelope.
Lading is a learning tool. It isn't difficult to remove. It isn't harmful to the barrel. It does teach you what doesn't work in that gun.
The only real way to learn to shoot cast is simple. Cast some, load them, then shoot them. Obserrve what happens. Learn from it. Repeat often. After a few hundred pounds of lead you will have a good idea what does or doesn't work for you.
Keep your loads safe and nothing will be harmed. Leading is a tool that show what doesn't work. Without failure there can be no real leaning.