OP, I agree with the majority your priority right now is safe and livable.
So get your stuff into the new place in position so you can do day to day living, it sounds like you can at least keep it clean so don't entertain getting into the plastering and stuff for now. It's just not important and the dirt will get you down even more.
I think you implied the electrics were sorted now? That's a win so tick it off and try to stop yourself thinking about the money. I'm not being flippant, I know it's hard but it's done now and needed doing anyway.
Have a look at the options people have posted for the washing machine, but do you have a back up plan if you can't make any of them work? Can you go to and use someone elses? (Now if no-one lets you do that your friends abu
)
You're friends aren't being unreasonable sweet, it really isn't that common for friends to be expected to help out with the level of DIY that you need a hand with, it's not UR to ask, but it is UR to expect them to be swarming round armed with sand paper and paintbrushes. I'm certainly not competent enough to help out and would be reluctant to fuck it up even more. Please try to put aside the mindset that this is some sort of slight against you, it really isn't.
This might not appeal to you, but I would be putting up fairy lights and anything temporary that might make the house more bearable to live in for the next few months while I worked my way through the rooms. I'd also be considering a house warming bbq while it doesn't matter too much what mess gets made. Not just to cheer myself up a bit, but to see what came of it. It's amazing who knows who and who can do certain things when you get chatting to people when things are relaxed.