Assisted assisted pull-ups

So the gyms pull-up machine is knackered so we can't use it.
I have now got a band and have been trying to do assisted pull-ups (*kitten* scared of hanging of the bar but there we go) I can't actually do an assisted pull-up and my friend has to take some of my weight as well. How is the best way to get from an friend assisted pull-up to just an assisted pull-up?

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