Side note, is there any way to account for task difficulty? For example, scaling a dangerous cliff vs. scaling a dangerous cliff in the middle of a blizzard without proper equipment. Do you just throw a modifier into the mix?
DW discourages adding situational difficulty modifiers to the basic Roll+Stat. If another PC is
Aiding or Interfering, there's a +1 or -2, and a number of conditions or setup moves give a +1
forward (i.e. modifier to the next roll) or +1
ongoing (i.e. modifier lasting until a specified condition), but there's no task difficulty modifier in the RAW.
So instead of saying "this is super hard, take a -3", what the GM can do is say "you can't do it at all, unless you do X first" or "you start to do it, then thing Y happens that you have to deal with before you can finish it," or what Munin said, making the consequence for failure much nastier in the harder case. Maybe the GM says "there's no way you can climb this cliff face without any equipment" and someone else has to
Spout Lore to think of a way to improvise some gear or
Discern Realities to find an easier way up. Maybe the GM says "sure, roll
Defy Danger with STR to start making your way up... okay, good, now, you get about halfway and then start to panic, roll
Defy Danger with WIS to see if you can keep it together..."