a4 bottom arm replacement - easy?

[magpies]

noticed over the last6-9 months that the inside of my tyres (near side front especially) have worn quickly ( I have used a couple of sets of used tyres) and belive it is more than just tracking - how easy is it tofind which arm is worn or is it better to just renew the bottom arms
my A4 2.5 tdi avant has covered 130k - everything else seems ok (touching wood )

[cptsideways]

Its a pretty easy job (makes a change on VAG cars!) simple nut & bolt job with it jacked up