hey neodude112320,
I didn't know any C/C++ when I started using Arduino and it wasn't too hard to get started. Luckily, there are lots of resources on the web. My first project was a Braitenburg vehicle and it took me about 1 day to put it together (and most of the day was spent shopping for the right parts).
You can see my light seeking robot here: http://www.alivingarchitecture.com/2010/11/braitenberg-vehicle/
Depending on how much more complex your project is, you can figure out how long it would take you... good luck!