Currently there are some problems with the bevel tool in Blender, though I think it will be addressed soon. There is a bevel modifier which is OK but applies bevel to the whole object and another bevel function on the menu brought up by pressing W key. The latter works on selected edges but I can’t get it to make a clean uniform bevel, no idea why.

I managed instead to make a simple nice uniform bevel on a piece of furniture using the inset extrude tool I found last week, so I mention it here for anyone in need of a workaround until bevel is fixed.

I used the tool on the selected faces, then moved the result outward.