Take your time honey,
They knew you as a 'guy' and it takes time for them to change. I take it you are changing ear rings for pierced ears?
That also takes time. If you are doing this in the bathroom, remember to put the plug in the sink, otherwise when you drop an ear ring it escapes down the plug hole, happens to me and very annoying.
My method is to put the front piece in first and hold it in place with my left hand. Then find by feel the rear of the ring and try to make sure it is straight and not pointed up or down, then pick the backer in the right hand thumb and forefinger, find the ear ring and place the backer on, don't force it, gently push.
I also wear lots of hoops etc that don't need backers, they clip into a holder on the ear ring and can be easier to use.
Also - ask your sisters to help - nothing like a bit of female bonding to get the pronouns correct, also a good excuse to check make up skills. 'How do get the eyeliner to look good and not lumpy?'
Hugs
Cindy