From experience; Changing flats, and replacing 2 tires on the same axle (using 2 Trailer Aids). Easy Peasy..no trying to get a jack under your TT.
As of now I can't think of a reason to use a jack to ever change tires.
EDIT: No finesse required without a spotter. Just look at your rear view mirror or just "feel" the trailer, which I do...