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I have no experience with game development so i can’t speak on what that takes, but the difficulty of modding very much depends on the game. Paradox games for instance are generally extremely easy to mod, pretty much anyone can learn to do it, though the skill ceiling can be quite high depending on how deep you want to get into more complicated scripting and/or 3D modeling new assets.
Whether or not these skills translate to making your own game i don’t know. But if you are interested in giving that a try that i think the place to start is perhaps a tutorial for one of the more commonly used engines like Unity.
My name is Inigo Montoya