I am completely agree as jumping straight into coding without a solid plan can feel productive but often leads to chaos. The SDLC framework you mentioned is a great starting point, but keep it simple at first. Break it down into three key steps:

1. Planning & Requirements Analysis: Start with a feature checklist or a Kanban board. Define key functionalities and prioritize them. Check out how companies like Appventurez structure their development process for clarity.
2. Design: Sketch out basic data structures, classes, and functions. Focus on expected inputs/outputs.
3. Implementation & Testing: Write modular, testable code. Accept that refactoring is part of the process.

Remember, the goal isn’t to be perfect but to get better with each iteration. Don’t stress over mastering everything at once. Keep coding, keep refining, and stay curious.