Well if you have spare PCs lying around you're already halfway there lol. Well, there's a great GUI tool to update kernel versions. It's called Ubuntu Mainline Kernel Installer
In this link you will find all the instructions needed to get it up and running.
I myself have been installing the latest kernel versions available for the last two years now(Except release candidate ones) without running into any kind of issues but if you want to keep it safe, install this application, go to Settings and check the "Hide unstable and RC releases" box and search for the 5.10.9 version on the main list. Install it and you should be good to go.
This application presents some weird behaviours sometimes such as telling you that a newer kernel version has been installed when it actually hasn't so, if that happens, just restart the application and try again. If you could, leave a star for the application author on GitHub to support their work.
If you have any questions or have any problems with the whole process, leave a comment here and I will try to reply as soon as I can