Just a suggestion, try using it where there's a prime setup (no targets). Maybe you don't need any rigging but trying something new over a gravel driveway or lawn for the first few times is less pressure than in a pinch over a green house that you can no longer get glass panes for. Then if a screw up happens it's a learning experience to walk away with not a disaster that will cost you or hurt some one.
Obviously don't use slings etc that are too light for the job.
Have a solid anchor
Be able to pu ma into your system, often 1 guy pulling the rope will barely take out the stretch
Don't drop (neg rig) blocks (big wood) directly into the zip line
Be aware of your tree, trees are strong straight up and down along the vertical length, zip lines pull sideways often from a position of decent leverage with ma on the line while adding additional weight with momentum.
Alway try to apply the least amount of shock load to a zip line system as possible.
Be sure you and your groundie have clear communication so he doesn't rock you and you don't torpedo him.
Have height, if your tree is to short and your piece is too long it won't work
Other than that like the guys above said start small learn the basics then just like any type of rigging, you're comfort level grows with your experience and that makes you a better tree worker.
Last tip from me, be sure to watch out for those sneaky damn eavestroughs, they move right after you cut some times.
Hope this helps enjoy. If you get a chance feel free to post pics of your zip setup or a pic of the bling you use to put it together. There is often no right or wrong zip setup if it works and nothing goes wrong but sometimes you'l get suggestions of things that could be improved on.
. I have just went back in to day to day climbing its hard to find climbers that will show up and work every day and pass a drug test. So screw it will do it.
