When you open the hood it's on the left side below the alternator it's roughly the size of a pill bottle. It's cylinder shaped and silver with a black electrical connector on top
If it's a Hemi, it's on the front behind the alternator. If it's not, it should be behind the engine. I don't know how hard it is to get to. I hope it's not to hard to do, as I have to change mine too. Sad thing is, mine has less than 25,000 miles on it.