Bumped into a guy working on my street, who seemed very confident at first. Couldn't help but notice the WW1 steel helmet and lack of safety glasses, and then upon closer look, the climbing line was like 10 or 11mm halyard line from a sailboat, knicks all over it, knicks and burrs all over the prussik cord used for friction hitch, the spurs in the live tree, and the kids running around the work zone. Sitting on the fir branch he's tied into, lanyard around the fir stem as a backup, but not tied over any branch. . . He struggled to the ground after a few questions and I then roasted him for the above reasons and more, but he is a certified arborist and runs a successful business blah blah. Funny part was he was wearing a Butterfly harness. . We may all differ in small ways, but if someone is not being safe and tarnishing our industry and hurting trees, I think they should be corrected or stopped. He is trying to learn, reads arboristsite and other sites - I'm sure he's reading this - if you can't afford to take time to learn from a professional and train, you can't afford to take the risk of climbing trees at all. Do your kids a favour and stay on the ground for a while - consider some time apprenticing with a climbing arborist an investment. I feel bad about giving you a hard time, but we all work hard to be professional - I don't like it when people waltz in with a website address and fancy harness and charge money as a climber. Like I said this is a small city and close group of arborists who are protective about the urban forest and the work in it. One more thing - don't use those ascenders you mentioned without getting some instruction first!