Sometimes none of the easy selection tools (=Magic Wand, Quick selection tool, select color range) is not enough because there simply is not enough contrast nor color difference. Then it's worth of gold to be able to draw a clipping path with the Pen tool, A beginner easily struggles hours until he gains any control over the Pen, but in the long run it really is worth of the effort. Curved borders are made much faster and more accurately than with lassos.