Replacing front timing cover gasket?

I'm attempting to replace the gaskets on the engine. I've done the head gasket and decided to do the front cover as well as I think I see leaks. I am having a hard time removing harmonic balancer. I did not drop the engine and tried using a gear puller to remove it. It won't budge. Wd40 applied and tried gently hammering on sides. It's difficult to tell whether I'm just not doing it right or it's not the right thing to do at all. From reading on the internet, it should come off fairly easily, so I feel that because there's not enough clearance for a gear puller to be dead center it's not applying pressure evenly.

I think that I need to take it off to replace the cover because there are a couple of small bolts I can see behind the pulley. I took all the other bolts I could find and the cover is moving very slightly.