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From BrewWiki
Once you have all of your extract mixed in, the next step is to bring your wort to a boil. This is best done slowly, as your wort will tend to bubble up a lot when it first starts to boil. The water you used for your brew has a lot of air in it, and these small air bubbles will be released as it comes to a boil creating foaming and a high potential for a boil-over. The best way to avoid a boil-over it to turn the heat down a bit as the wort just begins to boil, and then very carefully manage the heat during the first 15 minutes of the boil until you have a steady boil with minimal foaming. Also, do NOT use a cover on your pot! While a covered pot will come to a boil quicker, the first time you open the pot it will boil over immediately - making a huge mess of your stove.
Once you achieve a steady boil it is time to add the hops. Weigh the proper amount and drop it in the hot wort. Some brewers use a mesh hops bag to reduce the mess later, but if you can cool your beer quickly most of the hops will drop out after the boil. Stir occasionally during the boil to reduce the chance of extract settling to the bottom and carmelizing. I recommend you boil for 30-60 minutes. Boil time will affect your hop utilization and beer bitterness, so it but this particular batch is sized for a good idea to use a tool like BeerSmith to balance your hops and 60 minute boil time before you brew.
==Cool and Ferment==
