First you'll need to remove the engine mount bracket assembly........after that is just a matter of removing the bolt holding the tensioner in place.
The bolt is just below where #2 is pointing in this pic.
It's about a one hour job at your dealer.
Yes, that should work just fine.
The instructions are for replacing it with another dealer part........but you obviously have bought an aftermarket pulley replacement only.
So, if it is the bearing in the pulley that is bad, then you'll be fine.......