Making the Smeltery isn't hard at all, the hardest material you need to find is clay and you only need about two stacks of it or so. And clay is pretty easy to find.
As for the power drill, I find it sad that Dartcraft tools kinda outshine TCon's stuff in almost every way. I love both mods, so it's hard for me to choose which one I want to use.
I asked mDiyo about that in his thread on the MCF, and this was his answer:
The hardest part is probably figuring out the bonus.
I believe it was later in the thread he had mentioned tool durability bonuses. Something like hammers getting a 2.5x bonus and whatnot, but I can't remember what page that was on. The reason I did a drawn out statement was mDiyo only mentioned durability in the quote, yet as I mentioned it's not just durability but mining speed that is affected by different parts (specifically plates and tool heads.