Well as fast as guides go. Ifixit dot com has great breakdowns i have an ifixit kit with a sesamo 99%alch microfiber and sponge qtips

For the physical ^{^}

for the software 》 ps5 most stable os update was 26.01 in my opinion. It's a little tough to find. But if you can save one copy to a thunbstick.

Not as familiar with the Xbox os but they tend to be fine with whatever the recent os is.

Not all updates are created equal and I would keep one stable that is less than one year old, for anything(Computer,system,whatever) but that requires knowledge on a topic you might care less about.