Use your hill start assist (basically, push the break pedal hard for few seconds & car will hold breaks for 3-4 seconds - enough time to get you going).
Also, do not use the handbreak for this purpose - If you miss time by even a small amount, you can end up either breaking the handbreak cable or damage the tires)
This has nothing to do with your transmission. (Anyway, if you are moving backwards do not press accelerator hard. come to a complete step before pressing accelerator - I'd imagine, you could do lot of damage accelerating while moving back)