Step 1: Tools
Supplies: To press in the headset cups, you some washers and a big bolt.
Step 2: Install the Race
Wedge the shim if you need to, if not just put a small bead of grease on the fork and slide the race as far down as you can. Now you need to beat the race down to sit flush with the fork.
I use a large adjustable wrench and tap the race down using a hammer on the wrench. Keep turning the wrench so you tap it down straight.
Step 3: Remove the Old.
Don't hit the screwdriver up towards your face. If the screwdriver goes awry you may hurt yourself.
Step 4: Grease the Cups
I refused to buy the Park Tools $170 headset press. Don't get me wrong, it is very nice and I have used it quite a bit. But for $5 at McGuckins Hardware I made one. Just buy some long bolts, nut and a few washers. Get 8 washers, this will allow you a lot of flexibility when it comes to tightening down the cups.
Check yourself before you wreck yourself - yo!
Grease the bearings and tighten everything up.