2004 Buick Rendezvous vehicles seems to be running hotter t

The car seems to be running hotter than normal, it has plenty of the correct Coolant. It is cool out and the car gets up in between half and 3/4 mark for hot. It has never gotten there. It just started yesterday. I am wondering if it is the thermostat or the Water Pump. How easy is it to replace those on this vehicle. I havent worked on a motor in years. Older model chevy 350's. Both fans seem to be working it gets to a certain point then it starts to cool down but you smell the coolant.