In the main, this is a routine job. However, there is one aspect that can create a real cramp. All motorcycles manufactured since the early 1980s use tapered roller steering-head bearings, the lower stem bearing normally being press-fit onto the steering stem. To properly grease the lower bearing, it should be removed from the stem. Fifty percent of the time they slide right off. But the other 50 percent can be a bear to remove. While there are techniques to remove stubborn bearings without using any special tools, they take time and experience to acquire, and the end result is just as likely to be a damaged bearing as a good one. If yours is one of those that just won't budge, my suggestion is to farm out its removal, repacking and replacement to your local motorcycle or automotive machine shop, but find out beforehand how they plan to do the job. If they tell you they're going to chisel or burn it off, find another shop. Lastly, though I don't condone it, some bearings can be cleaned and repacked without removing them from the stem. In some cases this may be the most practical solution.