I did one as well. i didnt have much for tools so i jacked the trailer up on blocks. took the wheels off, tool axle off. then the springs. fliped the axle over so the perches were on top
then bolted the springs to the axle loosely. then aligned then spings in the perches and bolted everything down nice and tight. i wasnt able to get the parking brake to work again with the original y plate so a new one would have to be made.
easier then you think