Is it a clamp or set screw version? For set screws you should drill a small divot in the barrel so that may be something you want a gunsmith to do. Clamp version is easy, just make sure the gas port holes are lined up and torque the screws. Use a large paper clip and bend the end so you can slide it in the hole of the gas block and down into the gas port of the barrel to make sure they aligned.
I installed one on a BCM upper but I had to send the barrel to Adco to remove the FSB because I couldn't budge the taper pins. So depending on your situation and what tools you have you may need some help from gunsmith. Good luck!