Exponential is a good way to soften up the response around center stick, if it's too responsive. A twitchy airplane can be tamed down a bit with expo. However, if you're learning, you probably just want to reduce the throws mechanically or with the End Point Adjustment feature. Expo will become more important with wild aerobatics or 3D.

For instructions, it is important that you either ask for directions for your specific radio, or get real familiar with the manual. The manufacturers do NOT have a standard on Plus or Minus (+ or -) programming for this feature. It is possible to aggravate an oversensitive control by programming for expo with the wrong sign.

When you get past that, it's a matter of programming in a number, trying it, and adjusting it up or down according to your preference. Don't expect anyone to tell you "Enter +32% expo on elevator for perfect response."

Good luck,
Dave Olson