Must be lots of sites about changing them. Question have you done them before, how well equipped is your workshop, spring compressors, vice, tie downs, decent socket set and ball joint splitter.
At the risk of sounding condescending, how good are your mechanical skills. It is one of those jobs those is reasonably easy -6 out of 10. But if it goes wrong, someone will be dialing 999 as it can be extremely dangerous.
Goggle what can go wrong as well.
Hope that helps
Craig.