It's the easiest thing you can do.. Takes like 5-10 minutes if you have all the tools.
Make sure you have the right spark plug socket (and make sure it's magnetic). I have a 5/8" socket that I used on previous cars including a Mazda 3, I thought it would fit.. But nope, it's a 9/16" or 14mm.
Then you just need an extension, socket wrench and torque wrench.
The spark plugs should come pre-gapped so you just pop em in..
These are the ones I bought from Rockauto
NGK 94124
Edit:
https://www.amazon.com/dp/ (commissions earned)