Cool - I got it working.
I'm using port forwarding (3389 -> 3389) via TCP to re-route to my desktop here at home. I did however need to change the ip to 192.168.1.101 (instead of 100). I'm not sure why....

To simulate connecting from an outside network, I just typed in my WAN ip w/ port number on my other LAN machine here, instead of the LAN ip (duh) - hey, Im slow sometimes with this networking stuff

And the cool thing is that I can still have DHCP enabled, contrary to what the router manual says..(not really sure why it said I needed to disable it anyway..)
So as long as my WAN ip stays what it is, I can connect from work - otherwise, I wont know what ip to type in

-Ryan