1st up you will need a set of Dyna adapters from HD as the Dynas have a section that sits lower on the frame towards the rear.
i put my Ultra on the lift with one person me
push the lift as far under as it will go - carefully
then move the bike over off the jiffy and until the lift goes under then slowly start to pump the lift and the bike will balance itselft nicely on the lift.
Once on with its wheels still in contact with the ground STRAP it to the lift then slowly start to lift if its unbalanced front to rear lower enough to adjust and then carry on.
Its a matter of finding what works for you if you have a 2nd person then use them its easier - my wife can barely stand let alone move the lift or a 800lb bike, so i learnt to do everything one handed