Marks or small strips of tape top and bottom before you put the sheet on, as Neal suggests. And if needed draw a straight line from top to bottom on your drywall.
- Taping & Finishing Drywall Joints
- Inside & Outside Corner Drywall Joints
- How to Repair Small and Big Holes
- How to Build and Finish Drywall Arches
- How to Apply or Repair Texture
Free Tutorials at http://www.drywallinfo.com