1993 Dodge Caravan Engine alignment

I have learned in the repair manual that when ever an engine mount is changed the engine has to be re-aligned so that the cv axels are correctly aligned also. I dont quite understand how this is accomplished. I do alot of my own auto repair especially since the economy is so tough right now and have been unemployed and money is tight. I have to do these repairs and or alignments at home so can anyone help me understand this procedure more clearly? Thank you very much, Brad