Holy hell I actually did it without help, yippie
So the way I do it without cheating
(By means probably not the meta)
[Step 1]
Pick 1, 2, 3 and 4.
[Next Day]
Check results
If any are green take note
(It means the color is the right choice and is in the right place)
If any yellow then take note
(It means the color is the right choice but not in the right place)
(So exchange the yellow choices amonst other yellow/black outcomes)
If any black then pick something else from 5, 6, 7 or 8 to replace.
(Black means not right choice, that color isn't in the solution at all)
[Next Day(s)]
Repeat above steps until they're are no:
Black
Yellow
Success!
[Side note]
Save right before checking it the next day after having solved it, as some branches occur.
(One occurs from failing to find the solution also, so maybe save right before solving it)