How to Cut a whole in a curved mesh in Blender

Cutting a hole into a curved mesh is a common problem, particularly for new modelers. This tip shows you how to go about doing it using Blender's retopology tools. Whether you're new to the Blender Foundation's popular open-source 3D computer graphics application or are a seasoned digital artist merely on the lookout for new tips and tricks, you're sure to be well served by this free video software tutorial from the folks at CG Cookie. For more information, including step-by-step instructions, take a look!