This is what I did on my 08 Standard with just some basic tools and a LP gas torch to sweat the solder on ends.
I bought 200 amp (I know it is a bit of overkill but I worked a treat and was only $10) cable of Ebay in red and in black 1 metre lengths then took cables out of bike lucky I did as there are different size eyes on stock cable, could not source bent end for battery end so used straight one and just allowed extra length to allow for the fact that cable were looped into a U shape under seat I also found that it was not necessary to follow the exact path they used, this made fitting the heavier cable easy, starter spin much faster now