If you ordered a barrel that takes a rifle length gas tube and that has the same dia gas block as your old rifle, then you should be able to re-use your existing gas tube and gas block.
The only special tools you will need will be a torque wrench and barrel nut wrench (to properly tension the barrel) and a handguard removal tool to remove your handguard. A receiver block is handy, but if you're only going to do this ONE job, then you can pad your vise with rags, cardboard, or leather to avoid marring your receiver in the vise.
If you don't want to buy a handgaurd removal tool, you can pull down on the delta ring by hand, but it's pretty difficult. If you put the butt of the rifle (REMOVE THE BOLT CARRIER ASSEMBLY FROM THE RIFLE FIRST TO PREVENT ACCIDENTAL DISCHARGE) on the ground, then pull down on the delta ring (tapered ring at the rear of the handguard), you should be able to remove the clamshell handguard on your own. A helper is incredibly helpful though.