If you are looking to see "how it's done" just check out this 4.5 min. video showing the administration* in action. My sweet daughter allowed me to video her reading while I completed the miscue inventory and then assessed the data to determine reading behaviors and calculate an average rate. All of this is right here for you to see.
Administration and Visual of Miscue Inventory
*One thing I didn't do, but could have, was to ask her the comprehension questions at the end of the assessment. You will see that I just made up a few that I knew she would encounter in future reading experiences and further probed for her to justify her responses.