Macro Help

[dali_lb]

Much like Kerrik this is a typical spot Healing macro

/Cast 1
/g Random Group Spam msg
/cast 1
/pause 5
/cast 1

line 1: first cast attempt
line 2: Group msg - this also creates a small delay wich should be sufficient to cover recoverdelay if first cast attempt fizzles
line 3: 2'nd cast attempt
line 4: 0,5sec recover delay if 2'nd cast fizzles
line 5: 3'rd cast attempt

If Spell goes off in line 1, only the group msg in line 2 will happen. Line 3-5 will have no effect since your still casting

On raids you will often need a chain macro for CH:
Here we assume you anounce healing in group

/cast 2
/g << 1 >> CH on %t in 10 seconds. < 2 > cast in 3 sec. < 2 >
/cast 2
/pause 5
/cast 2

This assumes people count seconds themself.
Some guilds use the /pause command to tell when next Healer in chain casts, but this can be dangerous since different players may have local latency problems or lag spikes.