What's your LEAST favourite substep of any cube?

First 4 Edges on any cube bigger than 5x5. So many choices!! And/or I can't find the pieces I'm looking for.

Edit: although, strangely, I love F4E on any cube bigger than 7x7. And I don't know why. Possibly because I care way less.
 
The very first steps in Megaminx because I can't find pieces quickly.
Also, not really a substep, but all of skewb because I don't know how to turn it quickly.
 
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