One of the most often mistakes or overlooks is the break in oil. when installing all this crap water gets into areas that eventually end up in the oil pan, the best thing to prevent a spun bearing is to change the oil after the first startup, then again after a few miles. You may want to change it more than that. Use cheap oil if you want on the first couple changes.
Drain coolant before removing even the TB/UIM/Blower.