There are lots of creative ways you can play, i would first consider that the game is a team game first. So its good to have good communication. That said, from experience a lot of fights can be solo'd heal with some phases in the fight where 2 heals are almost mandatory. I.e if stunned by dreadknight in t5, split healing etc. So as a whm who uses cleric stance a lot my tips:
- have cleric stance hotkey in a very viable location so you can easily navigate (my case binded to me mouse key.)
- utilise sprint a lot.
- Make more use of stoneskin, since it doesnt matter if you cast it in cleric stance (also believe it doesnt raise threat like heals, not 100% sure)
- carry x-ethers incase your mana short
- Know when to cleric and not to, i.e in t5 if twintania uses her death sentence you usually got a 30 second window where she wont do that much damage, ofc you have to watch for other mechanics, however if a dreadnight is there you can help with that. Or if a tank hasnt got any cooldowns to mitigate a spell at a point in the fight then your better of healing, and mitigating damage.
- have divine seal regen up on tank/s and even medica 2 hot, or some form of damage mitigation like virus/eye/stoneskin. even that 7 seconds space time you can apply some dots, like for intense healing fights like t4.
- divine seal + mega potion mind regen.
- apply dots a lot.
- benediction if needed (remember the delay on it)
- whm spells have a lot of utility: from instant burst and slow to dots to aoe, stuns and damage.
- look out helpful macros/hotkeys: Heard target of target is a good one for heals and even throwing dps without having to click the mob or ally.
- practice
- have fun.
