There are a few different scripts out there for moving from Nucleus CMS blog software to WordPress, however, none of them 100% worked for me. So, I thought that I would share this with everyone. Sure, my hacks may not be the best way, and I'm sure a real programmer will come along one day and create a version of this script for the latest WordPress release, however, that was my main issue. The latest release of WordPress no longer has a "categories" table in the database, or a "post2cat" one... however the best nucleus migration script out there (i think) is this one, and it was written for an older version of WordPress with these database tables. So, when you install and run this script, you get errors saying the "categories" database does not exist. So, since I'm not a programmer, the easiest way to fix this was to simply delete the code that imports the categories, and I also deleted the code that imported that "post2cat" table as well, honestly not sure what that table does or did because I'm a newbie coder, BUT, the fact is, it worked!
I deleted those two sections of the code, and I was still able to import all my authors, all my posts and all my comments! So, of course the only thing that didn't migrate over was my old nucleus categories, so instead all my posts are under one default category now... but, I personally don't have many posts, so I'm ok with going in and creating new categories and moving all the posts to an appropriate category manually.
Now, what's wrong with the couple other nucleus to wordpress scripts I found? They all required the wordpress database and the nucleus database to be the same. So why didn't I just do that? Well, because I auto installed wordpress through my web host and it forced me to create a new database, PLUS, I didn't want all the tables to mix together, and then me accidentally delete a table that I shouldn't, because again I'm a newbie. So, I just feel more safe creating a new database, and the script above allows you to do so.
Long story short, it worked great after the changes and even though I have to make my categories manually, it at least brought all my posts, authors/members, and comments over.