"These equal syllables alone require, If you say this line aloud, all the words cause your mouth to scrunch up.... Though oft the ear the open vowels tire, ...but if you say this line, your mouth is forced open. (Pope says that the monotony of each line is tiring to the ear.)"
I'm afraid I must echo the sentiment Chera expressed in her blog and ask how the "expletive" do you do this?! Poetry is so so so hard to write, because you have to pay attention to how the words sound in your mouth as well as what they mean! It seems like this could become a very very frustrating verbal Rubik's cube. What if you find one word that expresses exactly what you want to say as far as meaning goes, but the way it sounds is all wrong among the sounds of all the other words in the line? Then you have to go back and try to reword it so it's more aurally pleasing, but what if the words then don't really get across the exact meaning that you wanted?! No wonder Dr. Seuss and Lewis Carroll just invented words when they wrote poetry. It could take years to write How the Grinch Stole Christmas with only conventionally accepted words in the dictionary.