Sounds like that may have been one of my posts.
It really depends on how far in you are. I replaced cups and cones all round on mine. With the axles out, i used a length of solid bar to slide in the axle tubes to strike the bearing cups, got them all out pretty easily. I made a tool to pull new ones in with a porta-power pull ram.
Assuming you are this far already and have the bearing cones removed from the axles and new wear sleeves ready. Find a length of waterpipe large enough for the axle shaft to slip into, it should be a neat fit. Slide the seal over the wear sleeve (if you are going to replace it) if not slip it on right at the bottom. Slide the new bearing cone on the end of the axle, slip the waterpipe over the shaft and it will rest on the bearing. Use a hammer and smack on the pipe to knock it down. It will get over the ridge then slide to the base, i used it like i was driving a star picket into the ground for the bottom one, pick the pipe up and smack it down on the bearing. If you are installing a new wear sleeve, the bearing will seat the sleeve.
Grease all the bearings before installation into the axle tubes.
With all the axles done this far, get an old cup and cut it in half, use a hose clamp to hold it as one piece behind the seal. Install the axle shaft into the tubes, put the chain on the sprocket, then slip the bearing over the axle shaft end, get your helper to push the axle in and engage the splines, there is not enough room to get the sprocket over the axle shaft if it is all the way in. Tighten up the bolt a little use a hammer to knock the axle hom to get it to seal the seal. Pull it back a little and remove the hose clamp.
Not a great write up, but it's essentially what i did.