I use the pen tool and trace a path around the object.
I then save the path and make it a selection.
Now that selection is Highlighted, I copy and paste.
Its simple once you get the hang of it.
Zoom very close to your object so you have no
white areas or parts of unwanted background elements
showing when you paste it.
Some people use the polygonal lasso tool.
But if you mess up, you have to start over with your trace.