Don't waste your money. Here's how to do it, and it will be easy as cake.
Get all the things I mentioned above, and here's how ya do it.
Step
#1 Take the bearing and put it in the freezer atleast 30 mins
Step
#2 Take the bearing out of the freezer
Step
#3 lightly coat the inside of the bearing with wd40, and get it to start on the hub.
Step
#4 Take the 4x4 wood and the Rubber Mallet as the hub is laying on a flat surface. Put the 4x4 wood on top of the bearing. Then gently tap straight downward on the 4x4. Key here is you have to have the bearing and 4x4 straight inline or it will be harder to do. As you are tapping on it. Keep using wd40 lightly on the hub and the inside the bearing. Now don't hit it to hard or it will damage the race. Just use lightly taps, and keep it lubed with wd40. If done right, it will slowly slide down the hub for ya. Now if it sits all the way do to the base of the hub your good to go. If it does not, then you will need to fire up the benz o matic and put very little heat on the hub you are trying to slide the bearing. Don't put to much heat on it, or it will expand to much, and you will never get it on. Most of the time you won't even need the torch, but it is just as in caser lol. I hope that helps ya out.