1) Lower the drain pipe. If it is attached to the side, release it and lay it on the bottom of your shower cubicle. Put a mop or something on it to keep it in place. It will move with lots of water draining out. If you have a shower over a bath or a high step into your shower, you should 2) raise your washing machine. An empty portable washing machine is very light, as you know. Improvise with some plastic milk crates, for instance. They’re light and can be stored easily. Make sure you keep an eye on the machine during all cycles at least the first time so you can see if there’s unexpected movement likely to result in it toppling.