If you go with the remove the intake manifold route be sure you get a new intake gasket/seal set. They are also a type of "O" ring, but oblong shaped and compress as the manifold is tightened. They are not re-usable.
Also, that method will give you a chance to clean out the intake valley area, which I guarrantee you is nasty and full of anti-freeze residue. You will not be touching the fuel delivery system to any extent, so you don't need to worry about that. Just make sure you get the instructions before doing so because like I said earlier, without them you will be taking apart a pile of stuff you don't need to.
Mine was leaking out the backside of the housing around the base and dripping down the front of the motor. I didn't know it at first and ran very low on coolant the first time I discovered it. Because of where it is, the coolant often vaporizes before it hits the ground, but usually you will see signs of a leak somewhere under the front of the car.
It is a pain, but you will be happy when it is completed. Do yourself a favor and replace any hoses etc. that need it while you are doing this.