Front wheel bearing is easy if you have the right tools, without the right tools you can make do with a screw driver and hammer. Nine times out of ten, its really easy to remove the old bearings but I've had some in the past that have been a dog. Thing is, if you never try fitting them you'll never know how easy it can be and it'll cost you a fair bit for somebody else to do it. Things that have gone wrong in the past though include the bearing centre falling out along with the bearings and leaving the outer shell still in the wheel, this was a complete dog! Bearing that are loose when fitted into place, this can be solved easily by dot punching the wheel. And one last tip, use the old bearings over the new one to hammer into place and don't hit it in the middle!