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How do you:
1) determine the size of the grids? Based on block size but don't exceed 2.5 inches usually. Also have the thingy (great technical term) that slides into the walking foot and guides the walking foot to keep distances consistent without needing to mark quilt except for first line.
2) determine a starting point for the grid?try to go across center and work my way out. I am using a DSM.
3) Do you do an entire diaganol from corner to corner, skipping over the applique, or work on a section at a time? Probably one section at a time.
4) how do you keep your line straight? Use walking foot and mark lines.