@David09 - That’s definitely good advice. Nowadays you can also use electric diagram software that works like a CAD program. You design your own circuits, and can swap components in and out with different amperage values. The software creates a “virtual” circuit and you can see the results of your modifications without blowing anything up.
It’s the next best thing to actual circuit construction and it’s a lot easier than messing with breadboards, plugging in components and so forth. Then when you’re done, you can take your virtual circuit and build a real-world version of it, knowing in advance that it will work.