How much should I be setting aside for taxes as a 1099 worker. Is it worth it ?

I’m now a 1099 employee and make great money but unsure of how things will balance out with taxes ? I will have beeen employed for 9 months from a real company and only 3 months of the year under myself. I do have a dependent. But now having to get my own health insurance as well as being shocked at tax time of how much I’ll owe I wonder is it worth it. How much should I be setting aside for taxes ?