Well, if you're new to light novels in general, it might be a bit intimidating. But for this one, I'd suggest getting a digital or physical copy of the first volume. Read the prologue carefully as it often gives hints about the overall theme. Then, follow along as the story unfolds, paying attention to the character interactions and how the 'jitsuryoku' concept is developed throughout the narrative.
A good place to start is by looking for reviews or summaries online. They can give you an overview of the story and help you decide if you'll be interested. For 'Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e', understanding the school setting and the concept of 'jitsuryoku' (ability) from the start is key. So, just dive into the first few chapters and see if it grabs your attention.