Enigne type or size should play a single part in the labor quote that a shop gives you. Most shops remove the transmission from the bottom, so it really makes no difference.
If you have a shop that is trying to charge you more for the removal of a transmission just because it has a V6, then I say find another shop. they are just trying to take advantage of you. If anything, let your BF go up there with you. If he is so good at making you feel like a stupid female, maybe he will do the same to them and get this worked out for you.