Do not use cast ironic sewer lines, tree roots will go right thru joints. Requiring severely corrosive, caustic and acid solutions to clear contemptuos, offensive obstructions. Can be most disillusing.
There is no easy way to clear migrating carp from lines other than
Weisenheimer's Needle, which requires trained, licensed to operate.
Measure twice, cut once.
Look at the nail, not the hammer. Watch the fence, not the blade.
If you hook your thumb over your belt you won't hit it with the hammer or leave it layin on the saw table.