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Ideally the lighting designer would not be deeply involved in hang, s/he would hand over the plot to the master electrician and the lights would get hung and circuited as desired. Of course this doesn’t happen. Even with the best of plots and paperwork something might seem perfectly clear to the designer and not to anyone else. During hang you should be around to help and answer any confusing points of the plot.
Doing a 'rough focus' during hang (point the lights in roughly the right direction, without actually having the lights turn on) can save time during actual focus because you will quickly discover problems like insufficient cable slack, lights clashing into each other, etc. Also remember to plug lights in as you hang them.
When hanging lights that will receive a barn door/gels, make sure you orient the light such that the barn door/gels will be slid-in from the top (and not the bottom); sometimes lights don't have a latch that would otherwise keep the gels/barn door from sliding out, and even if they have a latch, it can be worn-down, so make sure you aren't working against gravity.
When using tie lines to tie up slacking cables, try to ensure the tie line can be undone with one hand; this will make life much easier during strike.
Focus is the time for the LD to be the star. You are responsible for each light being focused in the correct position, you make sure that each lamp is casing light in the way and in the area you intended when making your plot. However you decide to run focus is fine as long as you get each lamp to do what you want in a reasonable amount of time.
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