You will never get your car to run it's tyres evenly or handle properly on FACTORY bushes or even non adjuster poly bushes. Ned's Powerflex bushes and settings of castor , camber etc make it possible to set the car up correctly. The factory set-up(let alone a better one) can never be maintained while the car is actually moving on the road around corners BECAUSE ALFA bushings are too damn soft especially the lower ones which allow huge movement in cornering , amounting to 10 plus mm's ----- hence the tyre wear and crap handling.
Regarding setting the alignment at a later date , you'll get a sheet showing the exact settings achieved after the Powerflex has been fitted . This could then be duplicted by someone else if you live hundreds of miles away but personally I'd let Ned sort it if you've been into a pothole or touched a curb very hard.
Further more , anyone having these fitted now has the latest developement which in my opinion totally transforms the chassis performance in fast cornering , even better than my first set (which I was very pleased with) . The only reason I changed again was simply a little sqeaking but the extra ability to adjust even further made a huge difference to my own car.