In essence, it can be a simple as that but I prefer to remove everything to do with the old connection before installing the router.

I would use Add/Remove Programs in Control Panel to remove all aspects of your current browser. That should remove the current dial up connection and any security stuff that Tiscali includes in their setup.

Don't use the Tiscali CD to install the router, just plug it in then go into the router setup and put your Tiscali login name and password in. Once the router makes the connection your PC should get it's connection to the net automatically through the NIC.