I recommend you work on your support network now. As you get less able you begin to retreat more on to yourself and your family and less towards the people outside your comfort circle. Make an effort to meet new people and make new friends, now. Also, you will want to stay home more as you feel less comfortable with your abilities, so create habits that will force you to go out and interact with people. For whatever reason, many people are uncomfortable with the disabled, they aren't trying to be jerks but it's hard for many, so if people get used to you early then it will be so much easier on you in the long run. One advantage of knowing what's coming is that you can change your behavior now so you can better deal with your changing abilities.

If you haven't yet, get in contact with the local Braille Institute so they can help you.

An interesting thing about humans is that we get used to whatever life brings us. Problems that seemed impossible to accept and deal with when you are facing them will suddenly be very manageable once you have to deal with them directly.

Be strong and good luck!