Piece o' cake on a 190. The radiator drain has a nipple for about 1/4" ID hose so you can drain it without spilling a drop. The engine drain plug also has a nipple on the end. Loosen it with a crescent or socket, then attach a suitable size hose to the nipple and route it down to a drain pan and hand turn about one to two turns out.

They did a nice job making coolant changes easy and mess-free on 190's.

Duke