I want to completely format my computer and replace my current OS with Linux. How should I go about doing this? Particularly, how do I handle finding all the device drivers I’ll need? I’m using a Lenovo ThinkPad T400
Thinkpads are very popular with Linux users, so there’s a lot of documentation out there.
The standard resource for Thinkpad users is ThinkWiki.
It’s quite likely that a standard distro install will be sufficient. The Linux kernel probably includes all the drivers you need. Possible exceptions are the graphics drivers (look at the Nvidia or ATI websites for those) and in rare cases the wifi drivers.