I have an older raleigh grand prix 10 speed I want to convert into a fixed gear (one gear, direct drive system) or a single speed (one gear, yet able to coast). I use parenthesis because I'm not positive I am using those terms correctly. Anyway, I only use my bike in the city, and I have not changed gears once since moving here a year ago... no lie. Ideally I want a fixed gear, however I have never ridden one, so I am hesitant to make the conversion. Is it possible to convert my bike to a fixed gear, try it, and if I don't like it easily change to a single speed (able to coast)? Or do these conversions require the purchase of separate parts? Any help would be greatly appreciated!

Also, this is my first post so I would like to say hello to the community and I look forward to becoming involved!