yes the wheel bearing will click and now if it is going out with this hot ass weather its even worse the greas will just fall away if it is no longer sealed..as for doing it yourself you can do it your self with a LARGE hydro c-clamp or a yes it does have to be pressed in but to save money if i was you i would take apart yourself buy it then go to a 25$hour place and have them press it...but one way to see if it is going is jack the car up so the wheel is off the ground and see if there is alot of play in it it should only spin not wiggle......but the clicking may also be from what cronic said about your tranny diff.mioght be going