how hard is it to fix the front stabilizer bushings and the trailing arm bushing

shouldn't be too hard i don't think, just unbolt, pop old bushings out, and put in new ones.

on what car?
The stabilzer bushings is a 1 hour job, the trailing arm bushings have to be pressed out, and pressed in which means you will be pulling the arms off, re-aligning, probably like a 3 hours labor and then alignment costs.