Changing job within a city is not very taxing. At the most, it affects your travel cost. In case you are relocating to another city or country - start by calculating the cost of living using 'Cost of Living' calculators online. Ask your friends who are living in the city you are relocating and add 20% to it to arrive at the living expenses. This gives you an estimate to work around your finances. Add this to your current debt or financial obligations. It's the most important step to prepare yourself on the financial front. Never rush into a job offer before calculating the living expenses.