Should I hire a wedding planner or is it better to do everything myself?

It depends on how much time and desire you have for this. If you're ready to spend a few months calling suppliers, coordinating details, solving unexpected problems a week before the event - you can get by without a planner. But you need to understand that it's genuinely stressful. I've seen people dealing with restaurants, florists, photographers all at the same time as planning the wedding as a whole - in the end, a lot of time goes into small things that could have been delegated.

With a planner, you come to a compromise: you pay money, but you avoid stress and get a guarantee that suppliers are vetted and accountable. The planner already knows who to work with, can find the best price-to-quality ratio, won't keep bugging you about details. At the same time, he doesn't skimp on his reputation - if something falls through, he's the one who loses face.

I'd recommend at least having a consultation with a planner - it doesn't obligate you to anything. See what options he suggests, how much it costs. Then decide for yourself: if your budget allows and you understand that you don't want to spend half a year in "calls and meetings" mode, it's worth the money. If money is tight or you're obsessed with controlling every little detail - go for it yourself, but be prepared for it.