1st part: things to do not.

- Don't consider Second Wind a crappy skill: having the best crit rating actually seen (i have not so good gear, and still i have 400+ crit rating w/o buffs), Second Wind can trigger critical healing pretty often.

- Don't forget to use songs. Many players look bad at songs because of that -20% damage. But remember, we are critical masters, so isn't so problematic that. And during endgame you'll need a source of mana regeneration, or tp regeneration, the fights are long, tiring, and healer's mana need to be at least 1/3 of his total, almost never dropping below this point. If you have a magic dps in your party, the -10% elemental resistance is nice, very nice.