You may want to just open it up and set it on the floor - throw a treat in it and see if he will go in there and eat it. I know Bosco will go to his carrier if it is like that and hang out in it on his own.
I would also start out practicing carrying him around in it maybe around the house or the yard something - so if he does cry, he's not annoying random strangers.
On a side note - I don't know if it just Bosco or not but he knows if I am not the one holding him in the carrier. For example, if I put him in a shopping cart while we are at the store he will whimper a little bit. But once I put the carrier on my shoulder he is happy as a clam. It must comfort him to sway and move as I walk. LOL
Good luck! I honestly think Nemo will learn to love his carrier.