Is this small business a good idea?

I have always dreamed of operating my own business. Now in college as a business major i really want to go into the decal business. We have a huge modified car interest at my school and no good graphic store. The one in my hometown made a fortune, i think i could do the same thing. To get started all id need is a cutter and some vinyl. an investment i can defibetly handle. But for some reason im way too scared to do it. Is this fear unfounded?