Will the iphone 8 be difficult to get at launch?

I've never bought an iphone at launch but i'm planning to buy this one, will it be sold out and stuff

Yep, unless you buy it from a big apple store, but you will probably have to wait in line for hours

At launch yes, you get people camping outside of Apple Stores for it. Wait a week or 2 and you'll be able to walk in and get one easily.