beginner game developer challenges

I recently decided to become an independent game developer. I am just starting to learn how to code in c++ using a book I
bought off amazon. Currently researching different software to use to develop fun interactive games such as blender, unity, and unreal engine. I plan on making games for desktop and mobile. But since I am just a beginner I lack knowledge on a variety of things, which I am slowly getting myself familiar with through practice. Based on my research it will take me about 2 years to make my ideal game alone using unreal engine. Although I have a concrete picture of how the game is supposed to play out in my head i just lack resources to make the game in a shorter frame of time. A general idea for the game is third person sandbox game with characters wielding different weapons and armor to conquer their environment. any tips would be helpfull thank you for reading.