unsecured broadband and privacy

[ZJonathan]

I am currently using a broadband connection that is unsecured. Generally I would not do this, however, it is a DSL or T1 line, and I have not had my internet installed yet. My concern is that I use my credit card number, and look up private information when using this network. Is the information I am viewing and sending over the internet going to be compromised? Passwords, what I google, card numbers etc... I have an idea that this person is technically savvy, because he will throttle his connection, etc...

Please any advice would be nice, I am under the impression my information is easily accessible to this person am I wrong?