Answer:
Kubla Khan begins its mental voyage in a deliberate and calculated fashion, despite the lack of regular grammar, rhyme, or meter throughout the poem. The opening four lines of the poem seem to be taken almost verbatim from a section of Purchas's Pilgrimage, with the narrative voice gradually slipping into a melodious condition. The narrator of Coleridge's apparently difficult poem seems to have a firm footing thanks to the author's paraphrasing of a comparatively accessible published piece of literature.
Step-by-step explanation:
This is just how I see it, so feel free to tweak the language to make it seem more like what you think.