You will be fine.
I can just about promise you that you will be good. The only time I see opposing fans in Seattle get a larger than normal amount of grief is when the fan antagonizes the home fans. You will hear visiting fans complain. But for the most part, these are fans that do not understand that attending an opposing stadium in visiting gear means you're going to get booed and heckled. IMO, as a fan who has attended over 10 games in opposing stadiums, you show up in the opponents colors, you are going to get booed, AT THE VERY LEAST. If this happens, and that is all, you got off easy. I've seen visiting fans in other stadiums get assaulted without provocation. I have no seen this in Seattle. I have seen people in Seattle get ugly. But it's always only when the visiting fan feels a bit too comfortable, and gets overly cocky with the home fans. This happens, IMO, because Seattle is actually super easy on visiting fans. Our ushers and security looks out for visiting fans more than any other stadium I've visited. That along with the overall accepting home fans, lets some visiting fans to get overly comfortable, to the point where they cross the line of acceptable visiting fan behavior, and do something to ask for it.
Oh, and if you're wearing a Jake Locker jersey, you'll get that much more rope. I remember the last time they visited, I had a family of Titans fans sitting in front of me. Wearing both Locker and Hasselbeck jerseys. They didn't taunt the home fans, and they didn't get one ounce of flack.
Unless you turn to the Hawks fans behind you and attempt to rub your fortune in their faces, you will be fine. Just be ready to get booed a good deal when you walk up the stairs. Be ready for that and you will be perfectly fine.