Dont worry about going wireless,you just password protect it,it's as easy as that. when I fix peoples pc's i sometimes use my neighbours unsecured wireless router just to test for a connection
Luckily she is a mate
Many people go wireless and it shows up as unsecured so you can connect,but if when you set up all you do is create a secure connection with a password then no-body is going to be able to use you internet.
Here is a quick overview http://www.ehow.com/video_4982591_se...s-network.html