I haven't made my first game yet, and the problem is whenever I have an idea for it over time it becomes to Big for how I feel a first game should be. Should I do it anyway?

Make, in the following order, Space Invaders, Pong, Pac Man. If that works out and you're happy with the results, come back and ask again. If you're not happy with the results, improve them until you think they're 'close enough'. If you get stuck, don't fret asking for help.
Best of luck :)

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