Don't misunderstand what I'm saying. I know you need the Netgear to host, I have a DLINK too (it no worky for hosting). I'm trying to understand how you have the DLINK connected?
Is your WAN port on the DLINK connected to a LAN port on the Netgear?
If it is, you don't need to do that, that's all.
It's simpler to join the two firewalls together via a crossover cable (basically using the DLINK as expansion switch ports and as a wireless bridge).
Double NATing will work, but it's a "department of redundancy depart" kinda thing in my view.
Now wireless devices may not cooperate with the Netgears DHCP, as always it "depends". More fun.