go to a local mechanic place that does engine and shit, and let them do your alt and wires. just tell them that you want to upgrade the grounds and they will know what to do.
or if they can't do the wires, just let them do the alt.
when i first got my iraggi i went to a local mechanic place and he installed it for $80, and he let me watch what he is doing, damn it only took him about 15 mins. and the best thing is, i learned how to do it so i just did it my self after that.