Lots of videos on how to hang a Hennessy...
the best site is the Hennessy one for all the basics. For other techniques that will save time in hanging, you'll find a ton of info on this site, or do a search for Hennessy hammock on YouTube.
I usually just: A) keep the hammock centered between trees, and B) keep the ridge line level - that handles 95% of any problem. Sleep well and enjoy your new Hennessy!