In terms of the waist, you can probably get that taken in by any decent tailor in your neighborhood. It's a cotton trouser, so it's an easy alteration to do. Personally, I get all my work done at Stanton Tailor (Stanton btw Orchard and Ludlow), but most places should be able to do a good job with that.
i'll go ahead and second the folks at stanton tailors. they've done some pretty incredible work for me in the past, and the price is definitely right. only downside is that you may have to wait a short while, but it's definitely worth it in my humble opinion.