1 - I'm afraid I'll break it every time I touch it.
2 - I can do the basic tasks, but don't ask me to change or setup anything.
3 = I'm comfortable installing software
4 = I'm a wiz
If you at all comfortable with a computer, I would recommend connecting your TV to a computer rather than a Roku box. The Roku is easier (and more elegant) to use, but there is tons of stuff out there that Roku doesn't have access to (Hulu for example, is free with a computer, but has a monthly fee with Roku).
An media pc (like the Dell pictured below) runs $300. It has an HDMI port, so you just plug it into your TV and go.
One of the advantages of using a computer to drive your TV, is that you can also use it to play DVDs, and it can be configured as a DVR.
To help you decide. Try loading something called "zinc.tv" on your computer. It is a front end for all kinds of internet media sites. Netflix is just the tip of the icerberg when it comes to what is available over the internet--most of it for free.