where can we find starter motor ?

got a car n he said starter motor sticks so give it a whack we do this lol. we have a few vectras dont know what it looks like or where it is coz its the same engines sizes but has'nt got it in the same place as the one we want to take the part from, we are female so would apreciate a pic if possible the one thats knackered has air con but the rest dont - 1.6 model vauxhall vectra ,, many thanks