Oh, for sure—replacing a printhead can definitely involve more than just swapping out the hardware. From my experience, some printers will require you to update the firmware or software so that the printer recognizes the new printhead. A lot of modern printers have chips in the printheads, and they need to be properly synced with the printer.
As for the whole "printhead pressure adjustment" thing, that’s not something I’ve personally had to deal with, but I’ve read that it can be a thing with higher-end or industrial printers. For most regular consumer printers, it’s probably automated or unnecessary, so I wouldn’t stress unless it’s specifically mentioned in the manual.
Now, about cheaper printheads versus expensive ones—I’ve tried both. Cheaper ones can work okay, but honestly, I’ve had mixed results. Sometimes the print quality isn’t as good, or the printhead doesn’t last as long. OEM (original manufacturer) printheads, though more expensive, tend to be more reliable and consistent. If you’re printing something where quality really matters, I’d go for the OEM one.
But yeah, definitely calibrate after replacing a printhead—most printers have a built-in option for that. It’ll save you headaches later. Hope that helps!