Thread is in the "How To's". As far as the ball joints, the main reason to flip them is to allow for easier alignments. If you didn't have problems getting it aligned I would not worry to much about it. The ball joint flip gives a little more down travel, but it is very little (something like 2cm). Hopefully that guy didn't charge you too much to install those springs. It is only a 20 minute job at home with hand tools. With power tools and a lift probably took him like 10 minutes!