Not sure about the tranny dust cover... could this be the flywheel cover? Not sure how to remove it either. I have a 92 Accord LX auto, and I remember this cover looked a little puzzling last year when I was thinking of an attempt to replace the oil pan gasket. It looked to me like the cover could not be removed until the oil pan was off. Never did it yet, but I've put some thought into it. Here's my procedure, which might be a bit of overkill, but I really don't want to do the job a second time....

Check the flatness of the pan gasket surface with a machinists straightedge. The edge of a metal ruler like that of a combination square might work, but is less accurate. Maybe have it checked at a machine shop for a few bucks. If the gasket surface sticks up at the bolt holes, pound them down slightly and carefully with a ball pein hammer on a wood block.... Or just use the new pan since you've already got it.

1. Clean both gasket surfaces with gasket remover if there's any bits of gasket attached.

2. Clean both gasket surfaces with carburetor cleaner.

3. Clean both gasket surfaces with mineral spirits (aka paint/lacquer thinner). Don't touch them with anything--they need to be clean enough to do surgery on.

4. Get a tube (or two?) of some Honda Bond (expensive at Honda parts) or the Permatex grey "OEM" silicone gasket maker. Put a 1/8" - 1/4" continuous bead on the gasket surfaces of the pan and the block. Put the bead on the inner side of the bolt holes

5. Attach rubber gasket to pan, raise it into place, and carefully bolt it on finger tight in two places.

6. Install and slowly tighten all of the bolts finger tight.

7. Tighten all bolts 1/4-1/2 turn at a time in a criss-cross pattern with a torque wrench to the precise torque spec.

8. Let the car sit for no less than 24 hours before filling it with oil.

9. Double check that the oil filter and drain bolt are tight before filling with oil.

Good luck, let me know how it turns out.

Andy