If you're using a spark plug socket with the rubber insert, and the insert is loose, don't use the rubber.
Instead, use a screwdriver and duct tape to retrieve the plug once loosened.
Wrap duct tape around the tip of the screwdriver sticky side out. Then use more duct tape above that point to secure it from slipping.
Use this tool to retrieve the spark plug, and also to lower the new spark plug into the vertical hole.
The hole is so deep that the rachet extension will remain essentially vertical.
Another tip: if the plugs have not been changed for >50K mi, they may appear seized. Unscrew them gradually for 2-3 quarter turns, then reverse and retighten. This seems to clear the threads, and then the plugs will come out more easily.
Also use some anti-seize compound on the threads of the new plugs. There is electrolytic action between plugs and aluminum blocks.
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