Questions about: technique

These are the steps: Create a CGBitmapContext matching the image's colorspace and dimensions. Draw the image into that context. Draw whatever you want on top of the image
You cannot cut or drill heat tempered glass. Not waterjet, not laser, not hot needle, not under water. Physics, not technique
Without (electrical) power tools, or a sledgehammer: Here are 10 options besides a hammer or Fire-setting. .
Why is my Drywall Cracking? Drywall cracks appear due to movement or settling of a house. This does not necessarily mean your house is going to fall down. Some settling is normal