@paulmckrcu yes, it's a sign of caring too I think and admitting the field is vast, you can know only so much, and details are likely to pop in and out of your mind at all times...
It strongly motivates me to check and double check things (with small programs/pr_err() at appropriate points/gdb plugged into qemu/etc. etc.) to 'prove' them to myself and to work from first principles + the source.
Of course you still worry, even then, but it is a motivator :)