Hi guys I'm new here but I actively follow the forum. I'm a 3D artist turn graphic designer and I have over 2 years experience working for clients however I am not a graphic designer by education. I am self taught and unfortunately this means I have skipped a few steps along the way, anywho without digressing more. I have worked with print and bleed a lot and bluffed my way through it, I have read countless FAQs and spoke to many print technicians however I still don't quite understand it. I am currently working with a client to produce a catalog however when you produce a A4 Catalog where does the print/bleed/margins begin or end. I notice If i produce an A4 document which fills the 297 x 210 (UK A4) in Illustrator or Indesign it asks me to scale (90%) when printing. Should I be producing the artwork to 280 x 189 allowing for 2-3mm bleed all around essentially leaving 11mm x 15mm of white space? Or should my document be 280mm x 189mm. Is there a standard?