How do i change the timing chain on the 93 nissan sentra?

There is no easy way hidden bolts limited clearance between the timing cover and inner fender. Even on a automotive lift the car has to be raised and lowered many times. Then the age of the car is it worth trying to get over 200,000 miles? If the car has other issues suspension problems. This is not a do it yourself job. If the timing chain wore a hole into the timing cover jumped timing and bent valves. Then you effort should be replacing the entire motor.