If you have them, drill bits.

I don't measure my gap - IMO it's too hard to measure a .1 difference; it's best to just listen to the engine and give it what it wants.

With the engine up to temp reduce the idle gap, then lean the LSN just until the revs come up and you get a stable idle.

If you like, repeat; reduce the idle gap a little further, then lean the LSN again until you have a stable idle.

At this point, conduct a pinch test to see where you are with the idle tune...

If you have a two stage idle at any stage, it means you are real close to an ideal idle tune - if/when you get a two stage idle, reduce the idle gap a touch more, and lean the LSN a small amount.

Eventually you will inspect the idle gap and think 'I can't believe that's right! The idle gap is tiny!' I know I did.

Once you have it right though, the idle tune will be very stable, you will rarely need to touch the LSN.