You will find out changing the plugs is easy once the plumbing is off . Might I suggest while your under the hood you pull, clean and re-crimp the low tension leads to the coils. Some have been known to work loose over time easy to tighten up with a pair of needle nose and will eliminate a little misfire monster from showing up and chasing you around for a while. Don't ask me how I know
The low tension leads are pretty easy to get at except #1 coil but it is worth the time for maintenance. And it like greasing the drive shaft splines is not listed in the maintenance manual. Just something most of us figured out over time.
low leads (Yeller) picture below on # 2 coil
Hope this helps.