What's the best way to install the TPS?

The screw underneath is crap how do i get to it?

The FSM isn't too friendly with the installation

 

You have to remove the entire throttle body, it's not hard, just make sure you get the vacuum lines back on correctly.

 

Get a little offset ratcheting screw driver with the interchangeable screw head bits at Sears: Craftsman 5 pc. Screwdriver and Wrench Set, Sears item #00941715000 Mfr. model #41715. It is possible to sneak it under there and get it loose enough if you are uninstalling a tps. I have done it at the junk yards for the s5 rx7 89s-91s with this little tool. When installing the tps you don't have to put the screw back on.