Well, I finally took the plunge and sat the TSHOOT. It's been almost a year since I took my last Cisco exam, so I was a bit worried.
I used the Boson on and off for the past year or so to prepare.
Like others have said before me: Don't worry about it. Even a decent Ccna with basic bgp knowledge should stand a pretty good chance of passing.
One thing though: I kept myself on pretty short leash timewise, thinking I would re-visit tickets I was unsure about. Well, as I found out, once you press "done" you can no longer go back to that ticket (which I would have known, had I read the instructions beforehand

)