The access levels and what they each have access to (I know security isn’t strongly enforced since filters can be used unless you’re a Guest user) are not well defined from what I can see. Is creating one user of each type and logging in as each the only way to determine what each Access Level really provides? I can’t find a good description in the manual or on the forums.
A basic layout of the access levels is here:
If you want to see all aspects then you could try the method you describe, just be sure to leave at least one administrator.
This is an area that we’ll be working on in the next version to provide more granular permissions (v2.5 or 3).