Okay, two days later and I just wanted to note that everything worked out fine.
I went back and read through the information TES Wiki info and TomLong's page, and I read through the thread posted by Psymon. I took my time and merge a couple of mods at a time, preserving the load order whenever possible by using the sequence numbering TESGecko. Maybe I didn't need to do that, but better safe than sorry. I tested everything and it worked nicely.
I finally completed the 27 armor mods and I merged all 5 Progress .esps - which gave me enough room to add that patches for Better Cities and Unique Landscapes. I have some other "item" mods I'm going to download, one at a time, merging as I go.
Currently, I have 244 esps (per Wrye Bash) and I've merged 32. I'm still nervous about merging scripted mods, etc., so I may have more questions (sorry, just trying to learn). I'm going to put that off until absolutely necessary.
Now some questions about what to merge next:
CM Companions. I know TomLong told me to be careful merging companion mods with different scripts. Right now, I'm only using CM Companions and several esps added by players (two here, six here, another dozen). All rely upon CM Companions .esm and .esp. (e.g. same masters). Can I merge these into one companion file?
The MMM "removal" files. No Beholden, No Swarms, etc. Can I merge these together?
Can I merge any of the FCOM files ('cause there's a bunch)?
Any other suggestions on files people general merge? (I know you say "game tweaks" but what kind of game tweaks? By definition, all mods are "game tweaks").
As always, thanks for your help.
~ Dan ~