ok, glad to hear you have it working.
for user level access, I would recommend starting off with a test set of pages created using the security assist wizard to become familiar with the tutorial and what it is trying to accomplish before trying to modify the user registration solution pack.
Take baby steps. Understand the material that the tutorial covers before trying to implement it.
It is always more difficult to modify a pre built application than to build the application with the functionality in the first place.
It _can_ be done, but you will need a good understanding of the modification and how it works before you can implement it.