Greetings,
If you do not have the die puller assembly, buy one. Vise-Grips and Channel-Loc pliers are not allowed in the reloading area.
The dies are an interference fit in the greaser housing. I use the leverage of the press to push the die into position. If you have the die puller, screw in the knurled 1/2-27 adapter and use it to push the die home.
If no die puller is available, Star used to suggest using a piece of hardwood and a hammer to "gently" drive the die out of the greaser housing.
There is a guy in eBay that sells the die pullers. A tool worth having.
Cheers,
Dave