How do I safely remove and re-install the print head on a Canon MP258?

First, power off and unplug the printer. Open the printer and carefully locate the print head. Remove the ink cartridges. Release any locking mechanisms on the print head and gently lift it out. Install the new or cleaned print head, secure the lock, and re-insert the ink cartridges. Be careful not to damage the print head nozzles or contacts.