There appears to be hydraulic lifters in this 2000 Monte Carlo. How do you set the valves?

Occassionally, on my 1999 Monte Carlo, when I turn the key all dash and exterior lights come on normal but there is NOTHING to the engine; it doesn't even recognize that the key has been turned. After a while...

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Is it hard to change a rear wheel hub assembly

It will run fine one minute then all of a sudden it just dies someime it eaey to start back up other times it not at my ropes end with it as you never know when its going to die

I cant get my car to shift in or out of park except for when I take somthing and push down the piece that needs to move in order for it to shift in or out of park. So I am guessing the problem is in the shifter...