You will need:
Tools to remove and reinstall it
First you must detach the tire
Make sure you don't lose the bolts
You know you will if we don't put this step in
Then make sure you clean it because your wife will notice when you bring her car back all messy
Now you will need to drive to the tire store with the tire
Ask the scary guy/girl at the desk for a new tire
Once you get the tire go back to your house with it and reinstall it with those bolts you probably lost.
This is where your wife looks at you thinking "why did I marry this idiot".