Did mine on the driveway, car on (railway sleeper) ramps. As long as you have a torque wrench, it really is just a case of undoing one bolt, greasing up insert, sliding in then doing it back up. I believe tightening torque is 74 ft/lbs , plus do a quarter turn once at correct torque. (check that torque tho).
I have no extra vibration, in fact the engine used to transmit a slight shudder occasionally at tick-over (prob a slightly dirty injector i thought), this has gone now with the bush added. So I 'know' it reduces movement, but I reckon any other effects I can feel are probably placebo.