Not very difficult at all. Most inserts have a labelling system on them - pull out the ones that are currently in there - check out the markings, and then drop down one or two sizes (each size usually equals 1/64th of an inch). Scrape down the hole to remove any prior residue (I use a dremel with a polishing attachment after I scrape w/a pocketknife), a dab of superglue on one side and put in the insert. After that's had a moment to grip, you can either put another drop directly across from the first one, or leave it as just one and have them work like vaccu-grips.
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