It's principles Wandering King.
You must stand by your principles and your confidence.
You don't waste time looking to see if it is sound and start analysing the position.
JUST DO IT!
Forget the pawn=1 Knight = 3 Rook = 5 nonsense, it's clouding your brain.
If you want to count something count Tempo
Both kings are uncasted, all four Rooks are unmoved, though it's move 17
we are still in the opening.
If Black takes that Rook he has wasted 5 moves to get it (count the move g5-g4
which was part of the plan.)
You have a pinned Bishop and an undeveloped Rook on a1.
Castle! and after Bxh1 and Rxh1.
You have every piece in action and those Knights. What wonderful Knights.
Also remembering you are already a piece up and after castles you are still
a piece up.
The win/loss of the exchange comes to the fore when the Queens are off.
Then you must rein yourself in and play normal chess.
Here you say you spent 5 minutires looking for the killer.
You say Na4 looks like the move of a genius.
Again you are giving priority to the Rule of Thumb .
Knights on the rim look dim etc..etc..
So it was not even given a second look.
Your job is to find moves that break the Rules of Thumb.
These are the genius moves and it within us all to play them.
So never ever think about saving a naff Rook v an active piece.
If you do you will have lost a tempo and his active piece will still be on the board.
And don't waste time looking to see what play you have.
Just do it. You have blackmailed yourself into playing actively. So you will.