8-3/4 REAR AXLE SEAL INSTALL ??

I've tried 3 times to install a rear axle seal in my 8-3/4 rear end. I keep messing the seal up and can't get it installed properly. I used a seal installer tool still no luck. Is there a trick to it? Would putting the seal in the freezer help?

I bought the exact seal that came out of the rear end so I know it is the right part number.