Walk around your kitchen. Don’t see a "coffee mug"; see a cylinder with a curved handle. Don’t see an "orange"; see a sphere with texture. Once you see the shapes, the intimidation factor vanishes. The Golden Rule of Shading
Your first 500 drawings will be terrible. Use cheap paper so you aren't afraid to make mistakes. The First Secret: The Four Pillars The Absolute Beginner's Big Book of Drawing and...
Everything in the known universe—from a Ferrari to your grandmother’s face—is just a collection of four shapes: (Everything round) The Cube (Everything with corners) The Cylinder (Legs, arms, trees, pipes) The Cone (Noses, mountain peaks, party hats) Walk around your kitchen