new 1/2 bath

putting a new 1/2bth in my mud room...have to go thru brick and down around a corner and into a joint and out...what do i need to look out for??? i'm compitant but have never done the drain piping into the main drain ...

drain

What do you have to look out for? How about doing it wrong? What you are doing is not the best "first" project. There are so many things that you could do wrong, and which can make your "ideal" 1/2 bath one from "hell", that we cannot even start to list them.