I just replaced mine in my teg and it is a DIY up to the point where the old bearings need to be pressed out and the new ones pressed in. It shouldn't cost more than $50 to get a machine shop do it for you, but the wheel bearings themselves are pretty expensive.

I would just get the money to pay for it, because even with me removing the knuckles myself and getting the bearings pressed out, it only saved me $100.