I've been looking into this too. Its not a real difficult swap in to any vehicle. The motor is essentially a 6bt (5.9) with 2 fewer cylinders. You can use just about every part manufactured for the 6 cylinder on the 4 cylinder. I believe The only custom work you would need to do it engine and transmission mounts, and maybe a driveshaft. Well, besides all of the obvious diesel conversion things (fuel system, gauges, etc) Otherwise, its a pretty straight forward swap. There aren't really any walkthroughs though because not too many have been swapped into rangers. You can get a ton of help on getting the thing running in your truck, but the actual mounting of the motor, trans, etc is going to be up to you.
2001 XLT 2wd 3.slow V6
3" Fabtech Spindles 31" Nittos M/T classic IIs
Tint, Sub, Lights, CB, Toolbox