How hard is it to build a chimney for a wood burning fireplace?

Tile liner can just be stacked, but it doesn't hurt to mortar them. You must use the "L" shaped brackets (at least in my building code area) You attach it to the existing brick wall, and then the other part of the "L" goes into the mortar of the chimney. Keep the chimney from seperating from the wall. Yes. Built my own.