When you first get them, it's fine for like the first 2 hours and then it HURTS. I personally couldn't even bite on my back teeth for like the first 3 days or so. Make sure you take ibuprofen/paracetamol and invest in soup. Your teeth are probably gonna feel like they're shaky and are gonna fall out, they also might make a cracking sound if you touch them but it's just because they're moving like they're meant to, it's fine.
After a few appointments, it won't hurt that much anymore when you get them adjusted
If you have to wear bands, wear them because I did and now I'm getting my braces off next week.
Also if they're really painful try ice cream/holding really cold water in your mouth because the wires are heat activated so it like releases the pressure and stops the pain.
Personally, I'm glad I got them because I no longer look like a rabbit