Yes... do a backup of the database.

Then, get EasyPop to CREATE a file of your current data to store in the TEMP folder.

You can also then use a COPY of this file to do a v_status = 9 "mass-delete" (see below).

Then, either manually delete all your product data (via your admin >>> catalog >>> categories/products ), or as i said, run an easypop file where v_status column is all equal to 9.

BUT... rename your images folder first. If you use EP to DELETE products, it will remove its associated image as well.

If your store is not yet trading, you can "afford" to try things out. But doing regular Dbase backups is critical.