Assistive Touch for the Apple Watch works like magic. It lets you use your watch with gestures with the hand of the same arm you are wearing your watch on. No need to use your nose! If you don't have it on, is because you don't know about it.

Apple Watch - Assistive Touch, Cheat Sheet. You can turn on Assistive Touch on the Apple Watch or the Watch app on iOS. Once on, a single pinch moves the cursor forward. Double pinch moves it backward. A single clench selects the focused item. A double clench opens the Action menu with important options like pressing the crown.