I've made 3. Its SWMBO's favorite beer of all time.
Add the extract at bottling.
Being your first time, rack to your bottling bucket. Then add a little extract and stir gently (enough to mix it but not enough to oxygenate your beer). You'll probably want to have someone in another room to taste it for you. The first time I did it, the smell of the extract was so powerful that I couldn't tell the difference between what I was smelling and what I was tasting.
I have added 1 tsp, 2 tsp, and 2 Tbsp to my three versions of it. The last one is a bit much for me, but SWMBO thinks its perfect.
Planning: Agave Witbock, Raisin Beer
Primary: GF Hazelnut Stout
Tertiary: Cranberry-Pom pLambic (est. bottle date: 03/01/08)
Drinking: Cab.Sav/Merlot Wine, Grand Cru, Hazelnut Stout #3, Ordinary Bitter