No idea how hard it is on a 1300 but I just did it on the 1100 for the first time. It helps A LOT to have someone around who knows what they are doing. I would have screwed it up completely without help. Also, you need a few specialized pieces of equipment - do you have all that stuff on hand?
The actual adjustment is pretty easy if you know what you are doing...
'06 VStar 1100 Classic - black with ghost flames!
Cobra sissy bar and luggage rack
National Cycle windshield
National Cycle quick release hardbags
Lindby engine guard
Driving lights mounted to engine guard
More to come when I save enough cash!