if you can add RAM and replace a SSD you can do that as well:
Have a look there - its just as simple as opening the machine and replacing a battery like in a clock =)
Not screwed - support for fingerprint readers was whidely added to linux thus now they can caus trouble as they finally work. As said, either look into removing the parts that enable fingerprint reading (some lib intput something I guess!) or modify PAM to not recognise fingerprints. But be carefull - if you mess up PAM you can lock yourself out of your system for good.