The difference between the DX and HF isn't just the engine and transmission. The HF has lighter weight bumper supports, a front bumper lip, a partially blocked-off radiator air inlet, optional passenger side mirror, a lower capacity fuel tank, smaller axles, steering knuckles and front brakes, among other things. Honda really cut out whatever they could to make the HF lighter.
To get the HF engine in, you would need the complete engine with manifolds, the engine wiring harness and the HF ECU. You would need to adapt the DX's main wiring harness to run the HF's port fuel injection (the DX uses throttle body injection). This is commonly known as an MPFI swap - You should be able to find numerous how-tos on the web.
To convert to a manual transmission, you'll need the transmission (obviously), the shifter and shift linkage, the pedal cluster from inside the car, the clutch cable, all the mounts that bolt to the transmission, and the rubber mount that bolts to the rear crossmember. If you end up piecing things together rather than pulling the whole swap from a donor car, add a clutch and flywheel to that list. Your DX axles should work fine with the HF trans.
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