remove the the harmonic balancer?

It is easiest if you use an air impact gun but if you don't have one, you are going to have to hold the balancer in place. There are a number of ways to do that but here is a guide that will help with this:

https://www.2carpros.com/articles/how-a-harmonic-balancer-works

Here is a video that will help as well:

https://www.youtube.com/watch?v=WITN7Q8SX1U

Below you will find the info about the balancer that will help with completing this as well.

Let us know if you have other questions. Thanks