How to start big data from scratch?

How does one embark on the journey of starting big data from scratch? What foundational steps must be taken to ensure a successful initiation into this vast and complex field? Is it essential to acquire specialized knowledge or can one learn along the way? Additionally, what resources or tools are crucial for initiating a big data project? Finally, are there any common pitfalls or challenges that newcomers should be aware of when starting big data from scratch?