You should be scared a lot of things can go wrong and it could get expensive.
However, you should still attempt it. Just do your research first and take your time.
I am liking your plug choice. You went with copper one step colder than stock with the latest recommended thread type.
Do not apply anything to the plug threads, put them in dry. I used to recommend light coat of copper based anti-seize but now I recommend dry threads.
When you change them here are some tips:
-be very careful not to strip COP retaining bolts
-blow or vacuum out spark plug wells before you pull the plugs
-make sure engine is stone cold
-use a
locking 9-12" socket extension to avoid issues with stuff getting stuck in the wells
-post pics of your old plugs so we can read them for you
-gap carefully to .054 using a feeler or wire guage and NOT a coin style
-carefully start the threads on the new plugs with your hand only
-torque to 15 ft/lbs or 1/16th turn past snug
-clean and condition your COP boots with 303 Aerospace Protectant or silicone spray or both
-use a dab of silicone dielectric grease (tune up grease) on the spring end where it connects to the plug