That TB bolt is a bitch. Before I got a flex head wrench I used a t30 bit that had a loop on the end. I would use a very small flat head to insert into the loop to turn the torx bit. It is possible to reach that bolt from underneath the car using a long narrow extension. It's still a PITA but doable. You're just gonna have to get creative. If you've removed the coolant line support bolts, you should be able to push the line bracket to the side to make it easier. GL man. You'll git er done!