I just finished setting this up and it's definitely this easy. The hardest part was growing the ESP to dual boot with Windows but that is basically just copy/paste the files to a bigger partition and change the partition type GUIDs.
Most of the guides focus on creating the PK, KEK, and db certs for enrolling/updating certs from userspace with signed .auth files but that is kind of pointless and seriously over-complicates it. I just created a 20-year db key pair with openssl (and PK and KEK just to make sbctl happy due to a bug), then installed the public db cert into the UEFI manually via the ESP. Didn't even need to use setup mode, although I suspended BitLocker on the Windows partition to let it reseal its key with the new PCR 7 measurement after the db update.
To finish securing it I have a separate key for PK and KEK and have already installed Microsoft's 2023 UEFI certs in the db (and added the 2011 cert to dbx with the updated bootmgr).
Most of the guides focus on creating the PK, KEK, and db certs for enrolling/updating certs from userspace with signed .auth files but that is kind of pointless and seriously over-complicates it. I just created a 20-year db key pair with openssl (and PK and KEK just to make sbctl happy due to a bug), then installed the public db cert into the UEFI manually via the ESP. Didn't even need to use setup mode, although I suspended BitLocker on the Windows partition to let it reseal its key with the new PCR 7 measurement after the db update.
To finish securing it I have a separate key for PK and KEK and have already installed Microsoft's 2023 UEFI certs in the db (and added the 2011 cert to dbx with the updated bootmgr).