you dont really need to lay any rags down, some coolant will leak out when you take the TB off, your making more of this then you need to.
take pics as you go, take your time. you'll be happy when you saved 80 bucks.
its 3 bolts and few clips and things. its easy compared to a lot of things.
if your just supper chicken. i understand.
what you can still do is remove the maf sensor, the intake tube, and the screen, then use a old toothbrush and a shop rag to reach in and clean the TB, you want to clean it as best as you can all the way around behind the butterfly flap there, (the brass plate) hold it open and clean the back of this flap too and its edges best you can. this helps but you wont get it as clean vs taking it off and cleaning it.
