Here are some simple steps to make it easier and quicker.
1. Remove all the dead and dying branches.
2. Remove all the crossing branches. (These grow from one side of the bush to the other.)
3. Remove oldest wood (easily identified by the grey corky bark).
4. Aim to have three to five strong young stems remaining - and shorten these back to about 40 - 50cm. Make sure there is an outward facing bud at the top of the shortened stem.