Suzanne's right eye

Hi everybody!:smiley:
I am reading a very nice introduction to Blender but I am now stuck on the part where I am asked to select the vertices of Suzanne’s right eye and detach it from the head while just pressing G,Y. I tried many times but whenever I start moving my selection all of the vertices are still connected to the head and it becomes a mess.

Does anybody know if this is normal?

Ensure you have only selected the vertices that are separate from the rest of the model
Ensure you have not enabled proportional editing (shortcut O and circle icon on 3d view header) https://docs.blender.org/manual/en/dev/editors/3dview/object/editing/transform/control/proportional_edit.html?highlight=proportional

you could pick one vert in edit mode and then just do Ctrl-L to select all other eye’s verts

happy bl