The TPS (throttle position sensor) is attached to the back of the TB. If you can, leave it connected to the TB and just unplug it from the wiring harness. If you do need to take it off the TB completely, make sure you've got some way of checking voltage so you can make sure everything is setup properly when you put it all back together.

Clean out the inside of the TB, along with the butterfly plate. You'll also want to clean the exterior and the back of the TB. There's not really much to the TB itself, so you'll see when you take it off. You'll probabaly need an new TB gasket, so keep that in mind.

Disconnecting the negative battery cable will reset the ECU and allow it to relearn some parameters faster. It's not absolutely necessary, but from a safety standpoint, you should disconnect the neg battery cable to prevent any arcing and such while you're working on the car ... especially with this project since wiring is involved.

Good luck.