Play more than one nation in MP

[WraithLord]

I've stumbled into a situation that requires I play more than one nation in an MP game (team game, I'm subbing for my team mate).

Assuming I have two dom-III CDs would the procedure I'll need 2 follow be:
1. Install 2nd instance of dominions on same PC (as first one).
2. Play first nation's turns using first instance and second nation's using second instance.

I'm asking just to make sure strange things don't start happening when hosting the game.