my focus/target/assist journey
I started off using focustarget which worked well for a long time, then I moved to targettarget and even though it has some downsides I was a convert and shouted that this method was the best and if you didn't use it then you were gimping yourself (boy did I get flamed lol) after a long time using targettarget and for reasons that are beyond me I switched to assist and focus with /click macros and except for the very occasional lag in targeting this method works best for me.

looks like this:
when changing leader this macro:
/focus Aztrid
/assist focus
then pew pew:
/cast Lightning Bolt; Lightning Bolt
so there's no specific targeting here, I use targeting for heals like this:
/stopcasting
/cast blood fury
/cast elemental mastery
/target [target=withthose]
/cast Chain Heal
/targetlasttarget
which targets my heal target, heals and then switches me back to my last target - don't know wether the last line is necessary since I'm assisting focus but meh