For some that aren't as mechanical as others it may pay to get someone who knows about Nissans aside from a Nissan service centre.
More a 4x4 shop and book it in twice a year to go up on a hoist and ask the mechanic if you could look as well as he points out things to watch.
Not all ppl here are mechanical minded or for that matter handy with tools.
I'm sure they will let you look at no extra charge lol so you can get a bit more familiar with whats what , and what goes where
It will give you more confidence as well