Zak, you can do it yourself. And for prices these days, you may as well just replace the axle. Its quicker, easier and way less greasy. You have to take the axle out to do the boot, so you actually save time by just replacing the whole axle with a new one.
Probably cost you $100. Boot and grease will probably cost you $40 or something(not too sure, just guessing on that) and you will have to take the axle apart, remove the clamps, clean out the old grease and check it for any damage internally, repack it with new grease, reassemble the axle and clamp up both sides. And thats if there is no damage to the internal parts of the axle. All it takes is some sand or gravel etc to get past the damaged boot. And possibly the other boot is nearing its life expectancy?