Where is the timing chain cover?

The harmonic balancer is the thing the large fan belt pulley is bolted to at the bottom front center of the engine. Your timing cover may be referred to in your shop manual as the engine front cover. The timing chain and sprockets are right behind it. This is a big job. Follow the instructions in your shop manual carefully and take your time. HTH. -Jim

Don't want to be a buzz kill, but if you don't know what the harmonic balancer is and where it is, you should have a shop do the job, not a good job to start on.