I'll pass on the advice I was given on my first batch - which was "sanitize, sanitize, sanitize". And make sure you keep a log of the ingredients and the method you use, so that in case you accidentally make an awesome beer, you'll know how you did it for future reference.
I also forgot to keep the lid off the pot during the boil, and instead had the pot covered most of the time. Apparently that's bad as it stops certain stinky chemicals from evaporating out of the wort.
Also, make sure you have loads of ice - I was amazed how quickly the kettle of hot wort melted all the ice in the sink. Other than that, it'll take a few hours, so it's a good idea to have some cold beers and good music to hand.