Have you ever changed a spark plug?
Here is a visual on where the #4 plug is as you are standing in front of your motor looking down:
To get to it you will have to remove the strut tower bar as shown in this photo:
**Note: this bar is red. It is the long bar going from one strut support to the other. yours will be black**
For the strut tower bar all you need is a 1/2 inch socket and the 3/8 ratchet. Remove the 4 bolts; 2 on each side. Pull bar up and put a side somewhere. Please take note on the top bar on either end the embossed 'L' and 'R' on each side of the bar. There is a left and right so put it back the way you took it off.
Once removed you can get to the rear plugs.
Tools you will need are spark plug socket and 3/8 ratchet, and about a 3" extension.