As stated this is an easy job, take your wheel off and have a look under there, a
guide for this job would be very short!
I did my lh side wishbone/balljoint a month ago, very easy job exept getting the ball joint out of the hub, a balljoint splitter and large hammer helps there.
Not being funny, but if your not very confident with a spanner just get someone else to do it.
You can get them from looads of places, i got mine from my local motorfactors, from what i remember it was about £20 for wishbone and balljoint.
Rick