Apple Watch app icons too small for your finger? Here's how to enlarge them6
There is more. Besides increasing the size of the icons, they will no longer get bigger and smaller as you move around the home screen. Sure, that might take away some of the cool imagery, but it doesn't mean anything if you can't press on the precise app that you want to open!
The whole process mentioned above can be viewed in pictures by clicking on the slideshow. You might find it helpful to follow along with both the written directions and the photos.
source: Reddit via RedmondPie