CCK for dummies. Conversion tutorial

Hi All

I am slightly following the CCK possibilities for about a year already and I think I am able to try it eventually live as it seems to be a good solution to a number of my problems. Unfortunately I am not sure where to get started. I've got plenty of traditional blog posts on my site and I am not sure how to convert them to CCK nodes or whether there is such possibility at all.

Could you, please, tell whether it is possible not to start CCKeing from scratch, but to convert existing content into CCK nodes? Any pointers to tutorials would be highly appreciated.