Make sure you have lots of patience on hand when you do the venting from the microwave. Also good to have some scrap pieces of lumber, phone books, whatever to get the heavy sucker close to the finished location. Get some flexible metal ducting in the right size and some of the high tech duct tape ( looks like chrome on a roll) on hand. That way you can be off a bit with the connections and not use up your entire vocabulary of cuss words.