Well it is something that a shadetree mediocre mechanic can do, if he's ambitious.
It's pretty easy if you have a Dana 60, but if you have a Dana 44 or a 10 bolt, it's a little more involved. For them, you first have to figure out if you have a flat top knuckle or not. Flat top knuckles were found on Dana 44's, mostly in the mid 70's. You can pick one up at a swap meet, junkyard, ebay, etc, for about $20 if you're lucky. You need one on the passenger side. Then it has to be machined, drilled, and tapped for the steering arm. You would pay to have that part done. Then you would buy the steering arm from someone, I recommend Sky-Manufacturing. They sell there arms for around $100, and I think they'll machine your knuckle for $45. Then you have to get a 2wd steering box, or the sector shaft from one. You can swap your entire steering box with a 2wd one, or you can swap the sector shaft from a 2wd steering box into your 4wd steering box. I would recommend just swapping the whole box if you feel uncomfortable taking your box apart. Then you need to get a draglink and a pitman arm. I made my own draglink for about $80. I also found a pitman arm off a ford van, and had it reamed to fit the 1-ton TRE's that I was using on my draglink. All totaled, the pitman arm cost me $23.50, and I like to think it's better than the superlift pitman arms that sell for $70, for complicated reasons I won't get into. It can get expensive, but there's ways to save a lot of money if you try. For example, here's the breakdown of my expenses.
2wd steering box - free (depends on how resourceful you are)
Pitman arm - $23.50
Homemade draglink from 1.5"x.375wall - $50
ES2234R TRE's from parts plus - $15 each
Jam nuts from sky - $2.50 ea
Steering arm from Sky - $135
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Total - $243.50
Cost of ORD kit - $400, and mine is beefier.
Things will vary a bit with a D44 install, but prices can be similar if you work hard at hunting for deals.
