I used to be completely scared to dock our sailboat, but now it doesn't bug me at all. My wife always says "Wow" now when I spin her hard around a shallow corner and pull right into a slip. There's no magic though - just practice and getting to know your boat. For example, when you parallel park your car, you just know where your bumpers are. When you pull into a parking spot, you know how close you can cut it to the car in front of you. Likewise, once you get to know the boat, you can make her do anything. By the way - learn the "Back and Fill" maneuver. It will be your best friend, and allows you to turn in a little more than your own boat's length WITHOUT the bow thruster... see http://www.his.com/~vann/KrgStuff/360turns.htm
for more info.