Busters guides are excellent for that sort of stuff, and u-tube is well worth checking out to if you actually want to see people take the hubs apart etc and replace bearings etc.
If you've already tightened them up a couple of times, you must already have a hub socket, and you'll know to replace the hub gaskets and lock tab washers. Other than that you'll need some lm grease, and ideally a torque wrench for replacing them (some people do without that though). Depending on how old and rusty your landy is, id even say to think about replacing the caliper bolts also. They have a tendency to round off if they are rusty, as they're a 12 point bolt and not a standard size.