Like others have said, you will hate that heavy sucker!!
If you are dead set on doing it anyway just watch a few you tube videos on how to remove an AR15 barrel. You will need a few tools like a Armors wrench, punches, crescent wrench, vice blocks, vice, possibly a torque wrench to use as a cheater bar and to measure torque of barrel nut. You may even need a new gas tube if you go with a different length gas system than what you currently have.