So I sized down on some skinny guys from some advice around the internet, having no experience with raw denim I went with a 29 rather than my usual size of 30. I'm wearing these jeans now and holy shit are they tight, but my real question is how tight is too tight? How much will these stretch? What are some guidelines for knowing if these will work for me? For instance I did have some trouble getting the first button done up and there isn't a chance that my phone will fit in my pocket
If you can wear them the day you buy them (ie you can do up the fly, and walk and sit with feeling like you'll pop a blood vessel), you should be okay. If you only lived down one size, you should be okay.
It's hard to say with out pics and more details.
But if you don't like them .. Return them. Don't do what people on the Internet say.