A typical "Pro" workflow involves using Quad Remesher to clean the base shape, Quad Cap Pro to fix any remaining holes, and Unwrap Pro to prepare it for texturing—all in a fraction of the time it would take to do manually.
Often used alongside these tools is the Quad Remesher (from Exoside), which can take an entirely "messy" sculpt and recalculate its entire structure into clean quads. Download File Z02 UNWRAP PRO, QUAD CRAP, QUAD C...
It can unwrap a one-million-polygon model in as little as 23 seconds. A typical "Pro" workflow involves using Quad Remesher