Today at 2:37 am

I'm thinking about replacing my battery before an upcoming two week trip. It's not giving me any problems but it's over 3 years old.
I've seen that it may not longer be as simple as just R&R a battery.
I read, wait a few minutes after you know everything is off, door closed etc. and let it sit 8 hrs with everything off for a reset.
I'm just checking to see if there's more to it.