[PyMOL] Selecting residues on surface only

[Charlotte Habegger-Polomat]

Hello Pymol users!

As a fairly unexperienced user of Pymol, I have not yet found a way to 
select all residues in one of the cavities in my protein of interest. 
When I render the protein as a surface, I can't select and visualize the 
individual residues in the cleft. When not rendered as a surface, I 
can't seem to select only residues on the surface and not those buried 
inside.

Is there a straightforward way to do this (select and visualize the 
residues on the (outside) surface of a cavity, with their labels)?

Thanks!

-Charlotte