First time healing (AST) - what should I know?

[ManuelBravo]

As an AST learn how your cards work as far as how extended road works. Depending on the card it will have different effects from aoe effect, to extended time and so on.

Know what you can handle; if tank over pulls, feel free to speak up. Ask for tips and advice.

Don't depend on cleric stance too much.

Know when to switch between them, your first priority should always be healing, dps when to slow or seems appropriate.

Go well geared, max your key trait and focus is possible on spell speed. Use materia, I take spell speed first and then ability speed if my gear slot can't take any more spell speed.

Make sure you have your cross overs traits active. Fast cast is a must.

Bring a supply of echo , and back up MP replenishment. Good for tight situations and CD's.

Use food, specially in mayor battles.

Last tank a few times, so you can see a different perspective. If you have you pretty much will have an idea what a tank needs.
Hope these helps and have fun.