D:\HardSID\driver>makecert -$ individual -r -pe -ss "Self Signed Drivers" -n CN="Self Signed Drivers" selfsign.cer
Succeeded

D:\HardSID\driver>certmgr /add selfsign.cer /s /r localMachine root
CertMgr Succeeded

D:\HardSID\driver>signtool sign /v /s "Self Signed Drivers" /n "Self Signed Drivers" hardsidusb_x64.sys
The following certificate was selected:
    Issued to: Self Signed Drivers
    Issued by: Self Signed Drivers
    Expires:   Sun Jan 01 01:59:59 2040
    SHA1 hash: A9ACCDAE13CCF9468942E1E1453DB9BC4327A01D

Done Adding Additional Store
Successfully signed: hardsidusb_x64.sys

Number of files successfully Signed: 1
Number of warnings: 0
Number of errors: 0

D:\HardSID\driver>bcdedit -set TESTSIGNING ON
The operation completed successfully.

D:\HardSID\driver>