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One on the right, behind the starter, one on the left, easy to get to. They are on the rearward bottom of the block wedge. Takes a hex wrench to remove them. They are O-ring sealed, low profile. You are not looking for a pipe plug like on some blocks.
Don't mess with the one behind the starter. The bath you take from the easy one will be fun enough.
I was looking at the T stat housing location, looks like I might be able to remove it without taking off the air cleaner & intercooler plumbing. Have you guys done this before, were you able to remove the T stat without removing anything else?
On most '06 and later, you have extremely easy access to the t-stat without removing anything other than the upper radiator hose. On earlier trucks, it is not as easy and there is some EBP tubing in the way. Since I have the easy one, I can't help much with the difficult one, except to say it has been covered in past threads.