the hardest thing is gonna be finding an HF.
The swap is easy but i wouldnt necessarily use a C5 (unless you already have one at your disposal)
id just put a GSR or a B16 in there (if you want VTEC off the bat) i personally would start off with an ever so easy LS swap.
after finding the car the next difficult thing is probably going to be wiring. especially seeing that the HF and DX dont have multi-point injection systems (or whatever they're called) you wont be able to use the stock harness or you may need to make modifications to the harness...