not hard at all take the front shocks off unbolt and put the arms off slide the metal bushings out then tap the black bushings out from the oppisite sides ,,,,then tap the new ones on and put the metal bushings back in and bolt everything back up
here is a link to some bushings
12 ASR Banshee, Blaster, YFZ450 Delron A-Arm Bushings. : eBay Motors (item 290415600488 end time Mar-29-10 09:17:32 PDT)