It might be worth finding out what model of Netgear router it is that Sky distribute to new customers. The last time I had any experience of this, they were distributing the DG834G ADSL Modem/Router. If this is the case for yourself, you wont be needing anything higher spec than the WG111.
If they are shipping out anything like the DG834PN you might want to look at something from the RangeMax range to make use of increased data transfer rates as well as actual range and signal quality from the router itself. Something like this.
WPA2 security is easily set on the router interface. Usually for Netgear the interface is located by typing in 192.168.0.1 into your browser and you'll be prompted for a username and password. Defaults here are Username: "Admin" Password: "Password". Once you're in select the Wireless tab and set your security type from "None" to "WPA2-PSK" where PSK stands for Pre-shared key - essentially just a password and totally unlike the less secure WEP where your key is just gobbledygook. Type in a password of your choice and click apply. Voila, your network is secured by WPA2. When anyone tries to connect to your network they will be prompted for this password to get any access at all.
As for your final sentence, it's none of my business if you want to post on here from your Dingwall toilet :004: