I start by opening the “character” window to access my tools a lot easier.
This is in window > type > character.
The tool I look for is the tool circled in pink.
This tool enables me to move the letter further or closer to the adjacent letterform.
I next want to select the letterform that I would like to move.
One the drop down list I can select different amounts of movement and how much of the gap I want to be moved.
This will preview how much movement moves and what it will look like making it easier to make a judgement call and to create the look I want.It makes it a case of trial and error.