Diff bush removal help please

Hi,

Another query for the back end of the car this time. I am toying with putting stiffer diff bushes, probably go for the mx5 parts ones (https://www.mx5parts.co.uk/competition-diff-mount-mk1-25-p-2566.html) …anyone got any tips on removing the stock bushes?

What difference does the stiffer bushes have on the ride?

Cheers

James