I know Mum did a flying cutting on the Acer tree the 2nd time, not sure about the 1st time though. A flying cutting is when you cut part way through a branch, then you get a little bag of damp soil and tie it where the cut is (mum uses cling film). This way the cutting is still fed from the tree why the roots grow in the bag. One you see the roots, then you can completely cut it off and plant.
I have successfully made cuttings from apple trees without the use of flying cuttings. Even though everything I read said apple tree cuttings would not work.
We are just coming up to spring, that's when you get the best tender fast growing shoots for cuttings. So dont worry what the text books say, just get hands on and have a go.