Welcome to the forum, @outsideandy .
Quite a task ahead of you… and you might want to first establish what you’re after in view of asset management (finding the stuff again in a few years…)
- Do I really want to get rid of the disarray?
- How much effort am I willing to put into sorting, keywording etc?
I do the following
- per film (or box of slides) take the shots and add one shot of the film base or the backlight for separation
- copy the shots into folders that reflect the shots main content
- make Lightroom read the new folders and shots
- add keywords (often per film, individual images as needed)
- make a backup
- start batch converting along the hints given in the guide
Sometimes, negatives are unevenly exposed on my films (unmetered exposures) which makes batch conversion produce less than optimal results for a few images. These image can be re-converted individually, simply un-convert before re-converting.
Now, if your negatives are way out of anything that resembles some logic, simply do as above, set whatever folder name you like, e.g. Batch 01, Batch 02 etc. You can always sort the shots later in Lightroom, or leave them where they are, which means that you’ll solely rely on keywords.
Rename the files? I’d not do it.