Assuming you meet all other requirements, can you take GTWF at the level as when ITWF is granted to a ranger?

The character planner is showing that I will be able to do it. I'm at the point now where I can take extra steps to ensure that I have ITWF one level before I have the opportunity to select GTWF, but it will gimp my rogue skills for a couple of levels if I do so.

I'd prefer to not have to apologize for 2-3 levels every time I can't see a trap, but I'd much rather prefer to not hose my character until level 18.

Has anyone out there verified that you can take GTWF at the same level as ITWF, assuming you meet all other requirements?

Thanks.