ok not sure if your camera is similar to mine or not but here goes.
i connect my camera to laptop via USB and startup digicamcontrol. From there you go into astronomy tab and live view and it shows some cross hairs. If you centre your star there it appears also in the blown up version over to the right. The blown up version also has the focus numbers for the size of the star so you can get your star focused to the lowest number.
Next i close out of that and and open up normal live view to do my aligning. you can put a diagonal cross hair on the screen to asist getting the star centred.
Make sure you have your exposure set less than 30 seconds whilst setting up in live view other wise it gets all upset at you.
ive also bought this
http://www.ebay.com.au/itm/Time-laps...item258ea703e0
which connects into a port next to the usb tether so i can take longer than 30 second exposures. you need to close live view down then change it to bulb mode for the intervalometer to work. the pictures then dump directly onto your computer for you to view.
Ben