Not to difficult if you are mechanically inclined. On my Journey you have to remove the serpentine belt first from the top side of the engine. Then go under the engine and loosen the V-belt and remove two or three bolts from a ?? (I don't remember for sure but I think it was the Serpentine belt tensioner). You don't have to remove the tensioner just get it loose enough to get the belt past it. I hope someone with better memory adds to this response.
Bob, Sandi & Marmaduke the Big Pug
SW OREGON 2004 Journey 39K, 330 Cat
If towing: a 2006 Mini Cooper or 1995 Wrangler