ARB=anti roll bar
LCA=lover control arm
Replacing the ARB bushes is more involved that replacing the LCA (or LCA bushes).
There is a strap that i think is spot welded in place... you'll need to use a cold chisel to get it out (i might be wrong).
Get some pictures and prove me wrong
For the ARB bushes you need to get the right bushes for the right diameter bar.. there are quite a few bars out there 17,19,21mm (there may be others).
Measure the bar you have (use calipers) the search the web.. Fiat Stilo ones are the same... just make sure you get the right size.
There is no Fiat part code for the ARB bushes.. as they recommend replacement as a complete unit (bar + bushes)
LCA is totally doable alone on jack stands.. i've done it.... basic set of wrenches and sockets, hammer, and a pry-bar
You can cut the old one out with a hack saw... and getting the new one in sin't that difficult especially if you have access to a wise.... or even easier if you can rent/borrow a bush/bearing puller.
If you want to buy the whole LCA.. get some from a recognized good quality brand(TRW, Lemforder, SWAG, etc) . No point in installing crap.