rag tops???

I was curious if it would be possible to install a rag top on my 1969 dodge dart. I was hoping to do it myself, but i am unsure on the amount of work that will need to go into it. I am sure that it will be a tough task, but I am sure that i can handle it. I don't even know where to go to look for information on purchasing a rag top or how to go about doing it... any help is great