Re Laptop make sure you have one that has a serial port and all the custom cables to plug into the switches / routers etc. (possibly having a second laptop for redundancy)
And seconding the physical logbook.
And seconding the physical logbook.
And it's easier to scribble a line in a physical logbook than to crank-up some editor, open the logfile, append an entry, save the file etc. If you're going to log absolutely everything, then adding an entry needs to be as easy as signing your name.
You could rely on your laptop; but laptops break and crash. a physical notebook is crashproof, drop-proof, and can even survive being dropped in a puddle. And short of pencils and erasers, it's intrinsically an append-only medium (except that you can still annotate old entries).
Maybe an electronic logbook works for you; I found that my logs were more comprehensive and generally easier to use if I kept them on paper. I got through about two notebooks a year; I used a stack of old ones to elevate my monitor (phone directories are hard to come by these days).
Also, opening a big notebook before describing your activities confers an aura of reliability on you; there's a reason why policemen whip out notebooks when testifying in court.