I read The Hobbit as a kid. Tried reading Fellowship, but was discouraged by the chapter after the encounter at Weathertop, a long, miserable journey through Mirkwood as Frodo gets sicker and sicker.[footnote]This isn't really that much of a spoiler. The story gets better, anyway.[/footnote]
I read Fellowship from the beginning as an adult, and realized I had good reason to quit before; that was a miserable chapter. Fortunately, the Counsel of Elrond at Rivendel is to follow.
I'd read The Two Towers from beginning to end once I finished Fellowship, and then got distracted before starting Return of the King.
From what I remember, Tolkien seems all about the long meandering journeys. He'll write on and on about the trees and the mountains and the flora, yet battles and encounters and events are short little stints before more about the trees.[footnote]In the book, the Battle of Helm's Deep was a single chapter. In the Peter Jackson movie, the Helm's Deep was half the film.[/footnote]
238U.