That's almost how I migrated, except I had to give a month's notice at work and I'd already found an address to register at.

If you had a job that could sustain you and you get a new job within EU that can also sustain you, it's about as expensive as you would expect a long distance move to be. There's no system in place as far as I know to block you from getting permanent residency in another EU country because you don't have starting money. That's just your inherent responsability to figure out like with any move.