Great tech article! When I changed mine out on my stock CB750, I couldn't believe the difference. It liked to shake its head a bit when decelerating. Not full on speed wobble or anything, just a bit of shimmy that you wouldn't want to take your hands off of. Now with the new bearings, there is no wobble at all, and you can take your hands off at any speed (not that I recommend it). It also feels better turning and stuff. It's an amazing difference for such an easy fix.
I saw my dad pack wheel bearings on cars and stuff when I was a kid. When packing the grease in the bearings, put a pile of it on the palm of your left hand... It's nasty feeling but it will wash off later. Hold the bearing at an angle (45 degree or whatever works) in your right hand, with the larger side down. Now try to scrape the grease off of your palm, not a back and forth motion, but one way. Basically, you are forcing grease up between the outer metal part and the inner part. The scraping is what forces the grease in there. This works real well, keep it up till it comes out the top real well and then turn it to a place with no grease. Repeat till it's full.
This works real well to get the old grease out when you want to change grease too... just scrape till clean grease comes out the top.
Now if all that sounds like too much hassle there are bearing packing tools that may work, but a wad of grease in your hand don't cost ya a thing for tools.
EDIT: Good old YouTube! This guy taps it, but its the same way to hold it, I like scraping better. http://www.youtube.com/watch?v=agxjGtmHV_4