I pride myself on sight reads so I usually play a map with hidden the second I download it.
I've always done this though and have learned to sight read hard patterns and stacks so for someone who hasn't played as much I would recommend at least playing through the map once or twice before turning it on.
If you want to learn to sight read the right way though just beast through it and teach yourself to sight read Hidden.
some days i'm just not feeling it and i don't play mods at all cuz i suck.
other days, when it's around 160 BPM or less I immediately just DT, if more, I might immediately just HR. If I do play no mod at all before adding mods, then it will generally be around 1-3 tries, otherwise I either would have put mods beforehand already, or I usually don't put mods at all.
as long as we have circles to click, no anger shall harm us