The anti-roll bar bushes of my 156 v6 are banging around. How easy is it to remove the bar and change the bushes? I know the subframe has to drop which sounds tricky. Is it a case of changing the whole bar? -I have seen reference to polybush replacements. Do these slip over the ends once off the car? Normally I don't work on the car myself but cash is in shorter supply at present. Who's good in North Kent area?