Let's start by defining some terms:
As you can see a doable task is different than a project. It is not to say that projects cannot be completed; it is that projects need to be broken down into manageable tasks. For instance, if your project is that you need to complete your taxes. There are tasks within that project that need to be completed: calling your CPA, filing an extension, gathering certain documents, etc.
A helpful tool for creating doable tasks from major projects is mind mapping. You can see an example below and you can also check out the YouTube video we did on how to mind map.