When I'm in Edit Mode and have some vertices selected in my mesh, I can hit s and move the mouse to scale the selected vertices, and I can see the amount I'm scaling in the info bar. But how do numerically enter a precise amount to scale? For example, 92%?
To scale the mesh in edit mode all you need to do is to hit S hotkey and enter 0.92 i.e. 92% and hit Enter to apply.
As all operations are applied to objects' coordinates, make sure to apply the object scale in object mode using Ctrl+A and select Scale from the menu to make is possible to scale the mesh proportionally in edit mode.