I installed the Dexter E-Z Flex wet bolt suspension kit # K71-653-00 myself,no help needed. Tools used were a 1/2 inch air impact for disassembly,floor jack, 2 hyd bottle jacks 12 & 20 ton,jack stands, bushing driver set and various wrenches/tapered punches and hammers.
I rolled the smoke wrench out to the camper but didn't need it,the old shackles and bolts came apart easily.The job took aprox 3.5 hours per side Saturday & Sunday. Take your time and clean everything good and lube the new bushings and bolts for reassembly.
I also installed 90 degree grease fittings for easy access and lube everything once a year,no problems since installation in mid 2009.