I assume you are using OEM bushes .....If so these are a real pain to do
I,m happy to try most jobs but after righting up various puller devises, and trying pressing etc I gave up......In the end I took the parts to my local Porsche OPC they did it for £25 (took them a lot longer than they expected so get a fixed price)
I Powdercoated the hangers so I think I had a harder job than most, if you want to try it then the curved end of the bush goes in first and it folds back on itself ...given the cost of the bushes and the chance of ripping one I was happy to pay Porsche to do it