1) changing jobs is a slow process, with lots of communication delays likely to stretch over days / weeks. Putting your finances in order takes a couple hours from scratch. They really arent mutually exclusive options
2) you should streamline your finances before looking to switch jobs so you can better assess your needs and what you are willing to sacrifice when evaluating market nuances.
3) He doesnt actually have any guarantee of another job. He should see what it takes to get out of paycheck to paycheck living at his current wage because that is his current reality. If he wants to prioritize saving money, he needs to start now by making any sacrifices he can. Those sacrifices become a motivational tool to increase his income in order to buy back the conveniences if he still wants them.