td5 manual says
1, clean stub axle and drive shaft and fit hub assembly to axle.
2, fit spacing washer.
3, fit hub adjusting nut. tighten to 50 nm (37lbf/ft). ensure hub is free to rotate with no bearing play.
4, back off adjusting nut 90 degree and tighten to 10nm(7lbf/ft).
5, fit new lock washer.
6, fit locknut. tighten to 50nm(37lbf/ft).
7, tab over lock washer to secure adjusting nut and locknut.
8, fit a new joint washer to driving member and fit member to hub. tighten bolts to 65nm(48lbf/ft.
9, fit original drive shaft shim and secure with a circlip.
so to answer your question yes the setting are important and other than a torque wrench you will need a degree gage which you can get from any halfords store for not very much. they are about the same size as a c.d with lots of setting marks on hope this helps you ;)