Persistence, determination, and whatever optimism you can pull together are essential.
Well said. That list of feedback about supplements (I can't remember where it is either, but it's British) won't tell you which ones will work for you as an individual. It's a matter of 'try lots of things and see what works for you.'
For me, everything that had an effect on my ME worked within a day, except for prednisone, which took 5 days to start working. Other people talk of benefits that took 6+ months of megadosing to start up, and at that time frame, it's hard to be sure of the correlation. Other people report having tried lots of supplements and found no benefits.
Also, don't limit your experiments to what others have reported to be effective for them. My two most effective treatments worked great for me, but haven't worked for anyone else, and both (cumin and iodine) were things already in my kitchen, and not on anyone else's list of things to try. Maybe dragonfruit seeds or some weird Chinese mushroom contain a chemical that will work on your individual ME.
My suggestion: start with the cheapest and most convenient supplements (and foods, herbs&spices, etc). I don't think the chance of a 'recommended for ME' supplement being effective for an individual is all that much higher than for a supplement chosen at random, so you might as well run through lots of cheap/easy ones first. If a multivitamin/mineral supplement doesn't make a noticeable difference, it's unlikely that testing them individually will make a difference. For me, something in those tablets did reduce my symptoms, so I then tested individually and narrowed it down to iodine.
My other recommendation is to keep good records, such as a food/activity/supplements/symptoms journal, as detailed as you are willing to manage. If you do feel better one day, what factor was responsible? Human memory is too fallible for that. My journal has been very useful for me.