I used to own a Pro197 and a Pro 106, which was pretty much the same scanner, but I mainly used software to program them and it's been so long that I really don't remember what any of the manual steps were.
I still have my 106 and my 197 and I agree, programming these is brutal even with the software. I really never got them setup to my satisfaction. That being said since I have both I may be able to chime in with some advice once you decide if you want to look at the software/cable method or manual programming. I've never tackled programming one of these manually I'll add.
If you weren't 'way up north I'd offer to come by and program it for you (I'm in the Terre Haute area). Yes, these radios are pretty daunting to program manually. With software, once you get the hang of it, they're not really all that bad. I have a 197 and a 651 that I'm pretty fond of...they do a number of things better than my newer scanners do them.