Do you own a torque wrench? If you have the torque wresh, some sockets for the right size then there's literally nothing you can do wrong! The hardest part is removing the castle nut from the hub, if you can get that off the rest is a doddle, if you can't then you know it's garage time
There's no weight from the suspension on the components at all nothing to pop snap or break. If your not confident then by all means take it to the garage but if you think you can undo 12 bolts and put them back then your done that's literally all it is! Use a bearing pullet to remove the old seating cones and pop them on the new arms