Lock and Load: The Reassembled Machinist Guide

[aabe]

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the thing about the loss of mana in A4S is that it's 100% planned around, losing your entire MP pool sounds terrible at first but when you save your resource skills for them it's really not that bad.
It also allows you to be really careless about your mana leading UP to wirbelwind casts, since essentially any mana you're still sitting on as it casts is "wasted", so you're free to burn it all away however you'd like.

for BRD I really only need to play battlevoice MP song at the same time as said above, leg 4 after the 2nd straf because the WHM needs mana for at least 1 res at pentacle.

Healers are not designed to run out of mana in an efficient group unless the healer themselves is playing incorrectly. There are extraneous situations like deaths and group mistakes that can kill your MP, but that's not on the healer.
You plan your GCDs and CDs as a healer just like anyone else, TP is a lot more straightforward to (heavy quotes) "manage" but healers aren't really so different.