Honey, I Need Some Space: Visually Adjust Kerning
You can visually control the spacing between your type (which is much better than numerically trying to figure it out) by using the same keyboard shortcuts for adjusting type that Adobe Illustrator uses. Here's how: To set the tracking tighter (tightening the space between each letter or word in a group), highlight the type with the Type tool (T), then press Option-Left Arrow (PC: Alt-Left Arrow) to tighten. Press Option-Right Arrow (PC: Alt-Right Arrow) to add more space between a selected group of letters or words. To adjust the space between two individual letters (called kerning), click your cursor between the two letters and use the same keyboard shortcuts mentioned above.