If you’re familiar with classic dnd Thief skills, that’s a great way to look at ‘skills’ in Crown and Skull.
Sure, everyone can move stealthily, trying to be as quiet as possible, and find a good hiding spot. But only the thief can try to move completely silently or disappear into the shadows without a trace. I’ve always defaulted to Batman and how he can just disappear versus your normal schlub trying to hide.
Now, with that analogy in mind, this is how skills are meant to work in Crown and Skull. Anyone can jump a few feet, but only someone with training can attempt to leap 10 feet or more. Anyone can try to open a stuck door, but only the warrior with the muscle skill can attempt to rip the door off the hinge and throw it at the goblin charging him. Anytime it is heroic, cinematic, or dangerous, that is when the skill comes into play, and that is when others cannot even attempt such feats: they simply do not have the talent, training, or ability to succeed.
For those things you feel are on the border between casual everyday stuff and heroic ability, remember there is the Crit or Nothing rule. Also, Flat Roll DEFAULTS to 6, but it doesn’t have to be 6 all the time, you could make it 4, or 8, or whatever the situation dictates.
Lastly, remember that there is a Difficulty mechanic in Crown - which scales from 1(easiest) to 10(nigh impossible) that is subtracted from the characters skill(or you can just add it to the characters roll - the math works the same either way). And that difficulty doesn’t have to be the same for everyone in the scene. An old wizard with the Ancient flaw should have a more difficult time leaping a 6 ft rushing river than a 22 year old green nosed soldier.
Make it your own, mold the rules around each situation as needed, and always remember, you’re there to have fun, and so are the players!