Ball Joint Help/Advice

Hi Guys

My front driver side ball joint is knackered and need it replaced. My mechanic told me Renault only sell the whole hub unit, after searching on here I found you can get the ball joint itself. I have told my mechanic this, hes looked at the diagram and says getting it out should be easy but hes concerned about getting the new one back in and is wanting some more information before he does it. Can anyone that has done it help me out with a wee guide on how to do it? The saving for just buying the ball joint is huge, would really appreciate some advice on this :thumbup1:

Cheers
 
if the old one comes out why wouldnt the new one go in?????

if one part is warmed up and the other not then they should fit back together!