The phrase "in your hands" is often used metaphorically and has several meanings depending on the context. Generally, it means that something is under your control, responsibility, or authority. Here are some examples: Responsibility or control: "The future of the company is in your hands." This means you are responsible for the company's future. Trust or care: "I trust that my project is in your hands." This implies faith that you will handle the project well. Opportunity or power: "The choice is in your hands." This means you have the power or ability to decide. In short, it often signifies that someone has the power or duty to influence an outcome or take action.

It means it’s for you to decide, or that it’s up to you to decide.

It is up to you.

"Control" and "responsibility", as Pip and Simon have said. To that, I would add "loving care". When you undertake something with "your own hands" it implies a sort of loving care because your hands are the most personal tools available to you for acting in this world. Listen, for example, to the religious hymn: "Whole world in His hands".

It’s your responsibility.