Another note. Using a good safety harness like a Hunter Safety Systems or the like will increase your confidence when climbing. Also, bag the treestrap and go to a climbing store and find rope you can fall on. If you call more than a few inches, your crotch and back will thank you! Climbing rope is some what elastic. Use about 15' of that. Hook on to that with fall grade cord with a prussic knot and carabiner. The cord should be lifeline rated. Have a climber look over your knots.