Stuff I've found out:
1.) Try it in the backyard before going out into the piney wilderness. Hammocks have a slightly sharper learning curve than most shelter systems (in my opinion). It's worth spending a night or two learning the tricks before depending on it as a shelter.
2.) I also have a Hennessy; make sure that the ridgeline is mostly taut but still has enough sag in it that you can take it in two fingers and turn it ninety degrees while you are lying in the hammock. That means that you have the correct tension on the hammock.
3.) Make sure that you hit that thirty-degree hang. It makes sooooooo much difference.
4.) I've found that having my foot end a little higher than my head end improves my sleep, but some folks think different. Try multiple combinations before deciding on one.
5.) Learn to set up your tarp! Quickly!
Trust me, nothing sucks worse than getting soaked when you know that you could've had your tarp up in less than a minute. I recommend keeping your tarp in the snakeskins (if you ordered direct from HH, rather than through a store, one set should come gratis) rather than the hammock. It's more important that you can set up your weather shelter quickly than it is that you can set up your sleep system quickly.
6.) Keep a drybag stuffed with clothes, a rolled-up CCF pad, or some other pillow-type object (heck, even a real inflatable pillow here will work
) for under your knee. At least, if you sleep like I do. I don't ever need a pillow for my head; the hammock supports it perfectly. However, I find that my left knee hyperextends if I don't have something under it.
7.) Have fun. Really, that's what this is all about.