My son hand his now wife had no real difficulty. He wanted to be married in the parish where he received his other Sacraments, but was a new grad and lived three states away. His fiancé was finishing her Masters’ degree on the other side of the world (Australia). They had friends and family attending from 6 continents and it was not a very travel friendly city.
They talked to the priest at his new parish, and the priest at his parish where he grew up. Yes, the needs of current parishioners would have come first, and yes there was a fee for the use of the church. The pre-cana or wedding preparation instruction was a little obstacle. We helped out a bit and the found a couple to mentor them while they completed online work. Met with the priest at his new parish two or three times during the nine months prior to the wedding.
I don’t thing the church made it difficult at all. They were very accommodating, but absolutely wanted to make sure its responsibilities were met.