I use a Belkin router as opposed to Netgear and the installation CD set up all the appropriate settings for me but having said that TalkTalk advised me to make the following changes:
Connection: change MTU from the default setting of 1490 to 1432
DNS: Change from 18.104.22.168 and
...and Belkin advised:
Channel and SSID: change wireless channel to 11.
It may be worth checking these settings and asking TT if they would apply to your new router.
Their helpline has improved no end and if first line support cannot answer your queries you are given a phone no.(still free) for their second line tech support (who are I assume based in Ireland as everyone whom I have spoken to has been Irish)and who are very helpful.
Another approach is to use their members forum which is also monitored by their tech support guys and is equally good.