I put mine back in myself and watched someone else take it out. Took him less than an hour to take it out and me probably around 2 to put it back in. Would have been less had I paid more attention to him taking it out.
I replaced mine in about 1 hour. Helps to remove the battery box and filter box to get easier access. Some people said they don't have to remove the front grille, but I have no idea how they got the bolts out without it (and that only takes 5 mins).
Do not disconnect the oil or transmission cooler lines... No need.