I need to do it, and have never done it before so any pointers to make things go easier would be greatly appreciated.
I was also wondering if there was way to swap axles/hubs so I can run some normal sized tires. instead of them little sized tires.

get the correct bearings...

pack them with grease... put em in the hubs... tighten them tight.. turn a few rounds. back off the nut and put them hand tight then tighted up just enough past hand tight to put the cotter pin


and yes you can swap axles or put bigger spindles and hubs on your current axle.

ditto that ^^^

There was a good post about this a while back with a lot of info. Think Westendangler started it...

There's a few more, but this one had a lot of info.

viewtopic.php?f=7&t=9472&start=0&hilit=bearings+trailer

The link is good. I would suggest a couple ideas for consideration. You can get inside seals with two springs. They are called double seals or double spring seals. The single ones always blow out with BBs. Second, you can buy Corrosion Block grease in a tube. If you don't know about Corrosion Block, find out. I came out of the Baja one time with nothing in my wheel but salt water and a little Corrosion Block grease still in there for lubrication. It was running fairly cool. Last, if you put together a road kit of extra bearings and stuff to rebuild on the road, don't forget an extra nut and cotter key. Ask me how I know. Try finding one in Esenada frigging Mexico. The only other place i had a wheel bearing disaster (on my truck this time) was in the Yukon. Those are the only places where bearings fail. They sit there and wait until they can really skrew you.

The procedure is simple, just messy. Put everything back the way it came out, and be sure the seal is riding on clean, smooth spindle. Some will disagree, but I believe in using premium grease too. In the old days, we did not know any better and used the same grease and grease gun we used on our farm equipment. Now, I use nothing but premium synthetic grease in trailer hubs.

I used to carry a spare set of bearings, races, seals, hammer, brass, etc. to do a roadside bearing replacement. Now I carry complete hubs (along with spare castle nut, washer, and cotter pin) with everything already installed and grease packed. A spare hub won't break the bank, and it sure beats screwing with bearings on the side of the road!

You can also get a spare tire mount with a spindle on it. That way you can carry the whole mess on the mount, instead of in your tool box.