The cleaning vids are good to watch. Of course, look at the S&B manual.
Nice to know what to expect, how the parts fit together.
Your fear of breaking something - eh, screw it, pretty tough plastic. I've broken a few bits off mouthpieces, they have six tiny springy tabs. If you rotate the mouthpiece half way around, seems I can get a better grip to pull it up and out, and better angle to replace it. My impatience and tremors impede my success, but even the mouthpieces with a missing tooth work fine.
Good to understand how the two pieces fit, how that oval tab is part of the lower half, how that sliding hologramish piece locks into that oval tab. Always nice to understand the architecture before trying to force things. S&B tells you to remove the sliding hologramish piece, and this is the most vulnerable to damage. I've snapped off plastic bits from these. Now I slide it back to unlock the oval post, but don't remove it completely. When you reassemble the two halves, make sure the sliding piece is slid back to allow oval post to emerge.
Don't get hung up trying to remove and replace the 0-rings. Not worth the effort, IMO. The medium o-ring around the base of the oval post can be troublesome. It needs to be positioned low on the post, to avoid it being clipped/snipped by the locking hologram.
I recommend the vape cleaning equivalent of sous vide, but please be careful. Depending on your own self-eval of dexterity and general words of heads-up caution with isopropyl alcohol and heat, you may be safer with the q-tip scraping method shown in the youtube vids and manual? Safety first. And, the CU scraping reclaimers out there will hunt me down for suggesting iso.
You are getting fancy with the picture-in-picture video editing. I can barely string a cogent sentence together. Keep strong, and keep a sense of humor if possible.