[bmxfu]

I had noticed that my front wheels are toed into the wheel well's, so i figured i would just take it to the local dealer up the road from me and see what they had to say. They told me it was my ball joints, The reasoning for it happening would be from lack of maintenance. I clean an grease my ball joints every 10k km so theres no lacking there. I do live in an area with very crappy roads and harsh bump's so im thinking could this be the reason? That is all irrelevant now as i do need to replace them. what would i be looking at for cost on two lower and two upper ball joints? and would i be better just getting them installed or just taking the time to do them myself?