Best way to add a lightbox to a pre-existing portfolio page

I want to add lightbox functionality on https://www.nycofficesuites.com/gallery/ only, without redoing the entire portfolio section.

I purchased a commercial theme and tweaked it to build this site.

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I’ve seen information on both plugins and doing this without a plugin. What’s the best way to add the lightbox feature while minimizing complications/ potential conflicts? The site is live so I want to be very careful. Thanks!

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