Hi Emmanuela Azubuike, like with every other thing else, the first step to getting comfortable with interviewing is to start interviewing.
For a junior developer, I recommend doing mock interviews a lot, learning your CS fundamentals (data structures and algorithms) while building your experience through contributing to OS projects and other personal projects.
I'll be happy to do a mock interview with you if that's something you're interested in, you can schedule one using this link bit.ly/tech-chat-with-meekg33k