In addition to the parts listing, these items are highly recommended:

Ink protection: Plastic bag or ink caps

Only needed in specific cases: Replacement ink for preparation process after cleaning (3rd party ink works, but will nag you).

This is only needed if your current ink set is risky to use in the event of a lost calibration (i.e. refilled with a used HP chip); RECOMMENDED if you use non-XL carts.

Optional (Stubborn clogging): Gloves and 91% alcohol