I ran my first instance... (Really messy..)

[Fef]

I guess you control your tank directly, so Mousover healing is not an option.

First thing, that I find to be enough in 99% of cases, direct your heals o FocusTargetTarget. With you tank the focus, heals will go to whatever your tank's target is attacking (usually you tank himself).

In situations where this is not enough, you might want to have 5 different keys associated to the five group members to throw heals to the appropriate character. Use of modifiers will help keeping the number of used keys reasonnable.

Also, you need an addon that displays what your healer is casting on you tank windows. There are several options for that, I use "SimpleCastBar" or something like that (will check up name once at home).