Concept art to model struggle

Hi there.

For a while now I have been wanting to model things for practice sakes. Mostly things I would see in a game such as a keyblade, a simple kart (from Mario kart) or something harder like mega man. I keep getting stuck early on with simple shapes. I will have a mood board with these things a different angles and plans on where to start and the initial shapes. But I get stuck, overwhelmed/overthinking is the best way to describe it. I want to know if anyone else feels like this and how they help stop this?