Ok, so I've gone through all the steps involved with adding an additional router to my current home network. I've disabled the DHCP on the second one, changed the IP address etc.
However I'm uncertain as to how I can test to see whether my second router is actually making any difference. The main reason I decided to get an additional router was actually to replace our older router, as several rooms in my house had a low wireless connection.
However my dad bought a wireless router that was using Wireless N which would not be compatible with several of our older devices that use 'A' and 'B'. That's when I got the idea to use both routers on the home network, so I googled it, followed all the instructions and it's connected now.
However I'm uncertain as to how I can test to see whether the additional router is actually working, whether it's actually improving our network, and whether devices are actually connecting to it.