Toyota Repair: How to replace Toyota Camry 07 water pump replacemnet, toyota camry, wheel alignment

Question
I have a Toyota Camry LE 2007 4 cylinder, 61k miles and recently I took it to the Toyota dealer for a (4) wheel alignment and the dealer said the water pump is leaking( not dripping any coolant) and they quote $450.  I would like to ask you if I can replace the water pump by myself.  Since I don't have the service manual I do not know whether this model, the water pump is driven by the timing belt or  it could be driven by the pulley etc.  Is it hard for a do it yourself job?  In the past, I was able to replace the timing belt, oil pump, water pump from Toyota Camry 92-96 5sfe with your instruction. By the way, is this type of 2.4 engine use the timing belt or timing chain? Thank you very much for your help.

Answer
This engine has a timing chain and the water pump is external on the front of the timing cover, I can not give step by step instructions here so i would recommend to do a google search there are most likely some utube videos or similar instructive sites that will help you .