Using something you are not familiar with impose disadvantage. 1d6
Proficiency just removes that so it is a regular test. 2d6
Masters grants advantage. 3d6
[ +- ] Tests
When you attempt to accomplish tasks your performance is determined through a test. A test is made by rolling two six-sided dice (d6). If any of those dice roll a '5' or '6', you've accomplished your task!
[ +- ] Advantage
If a Trait, tool, or situation would grant you a bonus, you get advantage. This allows you to roll with 3d6, instead of 2d6!
[ +- ] Disadvantage
If you would be hindered or set-back, you have disadvantage. This forces you to roll with 1d6!
We have not done much with noise and armor, trying to avoid getting too complicated, but it might come up in some situations if someone was in medium or heavy armor. Similar for acrobat. However if you had a type of magic armor that could easily be ignored.