1990 Chevy Truck replacing a rear wheel bearing

I own a 1990 chevrolet 2500, and I am looking for anyone and anyone who knows anyone who may be of some assistance here.

I am trying to replace my rear wheel bearing on both sides of my truck, and I am not having anything positive from the experience.

I talked to a chevy mechanic, and he told me to use a slide hammer, and I used it for a couple of hours and $120 later, and that did not work.

I was told by a few people, that there may be a small hex screw holding it into place, but there is no such evidence of that anywhere inside or outside the axle.

I would like to know how to properly remove that wheel bearing, and install the new one I bought for both sides.

if I was able to attach a picture with this email, I would have done that, but I am still able to send the picture of the problem if you would like to see it.

are you able to have any positive input for me on this matter.

blackjack.