The ones that need rescuing are usually sick or injured, so their demeanour is unpredictable.
They look and are portrayed to be cute n cuddly, but they are not called bears for nothing.
I have read Treemans blog on cat rescue hoping to get some tips there, although the Koala is very different from the cat.
I'm assuming that the cats being rescued are of the domestic variety, therefore being familiar with human contact.
Koalas are wild animals and won't come to you like a cat will, it is illegal to keep Koalas as pets.
When you get in a tree with a Koala you are on their turf.
I would locate and get in touch with wild animal veterinarians/clinics and/or animal control pros in your area and ask them what the issues are handling koalas. The main question in my mind is how hard is their bite, what can they get through (heavy fabric, leather etc.)? Treeman uses a heavy leather glove with a heavy fabric bag sewed into the glove cuff to grab and bag cats. If a Koala can go through a heavy leather glove than you're probably looking at one of the cinching neck grabs on a pole that animal control people use. For example in the U.S. we have the raccoon, similar sized to a koala, very cute but... you wouldn't want to tangle with one in a dark alley, they'd chew on you pretty good. No way you could get away with grabbing an adult wild raccoon with a glove and bag setup.
Well, I didn't know that they could be aggressive and I didn't know it was illegal to have as a pet. After you make your first Koala bear rescue you need to get a bumper sticker that reads "I've tangled with a Koala bear".
About a year ago I got a call to rescue a Koala, Mum and her baby were found wandering across a busy road.
By the time I got there she had found her way into a roadside tree.
Not the biggest tree, but the lack of size proved to be a challenging factor
We tried getting her to come down on her own steam by rustling a bag on a pole above her, but the only way down was past me and she was having none of it. She was blind but could smell me below her.
We could only get her down so far before she went back to her baby in the top of the tree.
Manoeuvring an 8' pole in a tree is quite a challenge.
In the end we decided to cut the branch they were on and lower them to the ground.
All in all a successful rescue, all three of us got down safe and sound
I recently did some major reduction pruning in a Eucalyptus for my uncle out in San Diego, CA. I was surprised to find that the throw line tended to dig in to the thick bark and get stuck. The wood was very brittle and didn't hinge at all.