The process isn’t difficult, but is it a bit involved.
In short, you cut the end off the bush, press out the centre, use a grinder with a flap disc to weaken the flange on the top of the bush, then a punch to gently fold it up until you have enough room to put a decent sized press tool onto the face of the wishbone, then put it on the press. Mine we very keen to stay in place, so they made a bang when they moved for the first time, but it only moved a few millimetres to not a missile as such!
The first attachment is the 4200 bush, the second one is a GTS one, to show what the aim is.
As Tim says, this is all about your appetite for risk, it takes a steady hand to do it, and it you are comfortable with it then there is no reason why not. But you do so at your own risk!
As for whether it makes a difference, my car was transformed and the bushes weren't as bad as some I have seen, and I have seen a few now.