You might consider this
kit. The page linked also links to spare coils for the PnP tank with the kit. Hope it is a simple enough kit for you. I'm including a video by Zophie. The video is for a slightly different kit, though it is similar enough I'd figure the same basic instructions apply.
Could not locate a video for the PnP kit. It is a rather new kit. As I said though the same basics ought to apply as the Caliber kit Zophie reviews in the video I link. These basic kits are becoming very standardized for ease of use. Usually after watching a quick video like the one linked you can get a good idea how to use the kit.
Also the kit is retailing for less than $30. So if you get it and find it doesn't suit, you're not out a brick of cash. If you are wanting simple, stick to what is called "regulated" devices. I
could suggest some simple kits that are mechanical mods. I sense even the simplest mechanical I would suggest
would be too complex, too much trouble to bother with for you. So yes, I think it better you stay with regulated kits.
Please understand I'm not writing this to be sarcastic, smart or have an "attitude" with you. I am writing it because I'm picking up your frustration and desire to "just vape". Seeing that come across from you, I can only see guiding you toward the route of regulated devices. It only makes sense to steer you that way. I myself don't use regulated device, save one, sparingly. To me they're too complex. A circuit in them can go out and you're left with a paperweight.
There's nothing wrong in how anyone vapes. What is right for you is what you feel right. I'm not saying there is anything wrong, only saying I have a different preference. We all find our own way to enjoy vaping. I hope you can find a kit that works for you.