...if you need to replace the wheel cylinders (and, most likely the brake shoes) only take one side apart at a time, so you have one side to reference when you're trying to put it back together.
Best sage advice ever, when it comes to drum brakes.
Never could understand why they charged more for a disc job than a drum job!
If you do take the axles out, there are a couple of things.
Make sure you clean and smooth out any irregularities in the axle surface where the seal rides. If there's a little groove, it might leak later even with a new seal.
Unless the parts stores are very handy and have your parts most of the time, verify whether you have a big-bearing or small-bearing first, then have the new bearings waiting and ready. Check out the identifiers on the Wild Horses site for that info if you don't already know what bearings you have.
Although you can install them in a garage, unless you're well outfitted and familiar with pressing things on, just plan to take them to a local shop to press on the new bearings.
Don't forget to take the backing plates with you! They have to put it on before the bearings go on and might not remember if they're not sitting there with the rest of the parts.
The process is actually quite easy once you've done it, but since some axles come right out with no effort and yet others seem to take an army of helpers, a diesel truck to hook the yank-strap to, and 42 special tools, just be prepared for some wheelwell time and remain calm grasshoppa.
Just kidding (mostly), but some do fight you a bit if they've been in there for 30 plus years. In those cases you can sometimes make it easier by reversing the drum, setting it over the wheel studs and holding it on with a couple of lug nuts. This gives you some more leverage to pull with.
Sometimes you might need to borrow/rent a slide-hammer type puller to put extra force on it, but a stuck one can usually be persuaded with the reverse-drum method. Chances are the leaky one will just pop out by hand.
And above all, have fun! It's one more thing you'll now be intimately familiar with on your Bronco.
Paul