Indeed, follow the flow-chart 
Actualism flow diagram - #155 by claudiu
You were feeling good before… you remember this feeling good before… you trace back to see when exactly that feeling good stopped happening … then you see what it is that caused the feeling good to stop happening… then you “see the silliness” of letting that take away from feeling good — and once you successfully “see the silliness”, you are automatically back to feeling good!
It really does work this way in practice. There is no hidden meaning behind the words, or anything like that. This is a literal description of how it works!
So the task for you is to try these steps, and if it works great, and if not then if you can identify which of the steps in particular is not working then someone may be able to help in more detail. I know if it were me, the issue would probably be that I hadn’t even tried doing the steps… it took me a few years to start doing it consistently lol.
Hmm I didn’t quite understand your re-phrasing of it. But it’s just a grammatical thing. To re-phrase it more clearly I would say:
The commonality of all these is that the way the enjoyment is ‘done’ or ‘accomplished’ is by feeling the enjoyment.
It’s just emphasising that the enjoyment is a feeling, as in an affective thing (which can be an emotion/feeling or a mood).
I like Henry’s way of putting it - “Vibes first!” 
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