Custom Post Types – Hardcode or use a plugin?

Is it better to use a plugin or hardcode a custom post type into your template? I have tried both, but not sure which would be better in the long run.

I am creating my portfolio website, so I have a lot of posts to be included. Once I choose (plugin or hardcode) is there a way to transfer my posts to a different post type later? Or would I have to enter in all of the info again?