Advice?!Rear offside bearing hub assemby

[07finnk]

Hey guys, need a spot of advise from anyone with any experience with 2002 k11s i been told i need a new rear bearing hub assembly for my micra and i been quoted 130 from the garage as the hub assembly part is usualy 100ish quid, managed to find one on euro car parts on discount for 72 quid and am contemplating doing it myself, is it a major task or relatively simple?!