So you have questions of utility.
Say again this is 1840 and you say... "Well even if we free the slaves, the poor slaves don't own any land, or have any skills living without plantations; so these slaves will be stuck in a situation that is just SLAVERY UNDER ANOTHER NAME..."
But I don't think about "what will replace the police, courts, public schools..."
I think about "theft, violence, and kidnapping are immoral."
And FORGET about "what will exist to REPLACE these things?"
Just focus on the morality. You ARE NOT CONFUSED, and DO NOT DOUBT the moral position you hold.