My twins are a year old, and it has been a crazy year for us! I have 3 older children 8,6, and 3. In my case, crazy has been amazing!
As we speak, my twins are playing peek-a-boo with each other around the corners of the walls and laughing like crazy! I'm so glad they have each other. My 3-year-old insists he is the one making them laugh. He is a proud big brother. Twins have brought such joy into all of our lives.
I have tried to maintain a relationship with my older kids, and this has been the most conscious decision I've had to make each day, because honestly, the babies just cry louder and they are the obvious "need my care right now" duo. I really have tried to plan one-on-one time for the older kids. Planning and following through has made all the difference for them. Their attitude towards the babies is key. We tried to get them excited from the very beginning, and never made excuses for ourselves when it came to taking care of their needs, such as "The babies take so much time, I can't do that for you." Instead, "If you can help snuggle one baby, while I dress the other, I will be ready to do that for you. I can tell the babies love it when you help."
Preganancy was the hardest part for me. I went into early labor, but in the end, made it to 37 weeks. Keep your body as healthy and strong as you can. Listen to yourself, don't over-do it, and eat lots! Try to find a variety of good healthy foods.
The first three months, plan on schedule, schedule, schedule. Feed them together, change them at the same time, and get them to lay down at the same time. Others have found this impossible, I found it to be a lifesaver. Tandem breastfeeding is interesting, and only you will know how to make it work, or if it doesn't work at all. Start now and look up freezer meals that your family enjoys, and make them ahead. Research this forum to find how others are getting the sleep they need. My husband was always willing to take a shift from 6:00 p.m.-midnight if I was lacking. Don't be afraid to ask for help, even now, when your pregnancy is hard. If you don't want people taking your DS, ask them if they'd be willing to bring in a meal, or take a load of laundry (especially easy things like towels, sheets, baby blankets and spit rags that they won't have to sort). A Snap-and-go stroller was easiest for me at this point because the frame was light, and I never had to take sleeping babies out of their infant seats.
The next few months will be much nicer with a nice double stroller. Lots of opinions here on the boards. Bouncers and swings are nice, but they aren't anything like a mama, so you probably won't need two of each, once again, I know others disagree. Lots of mommies figuring out how to wear two babies out and about, I never did. I used the stroller for such occasions.
Take things one day at a time! Anticipate and plan, but don't overwhelm yourself with the what-ifs. You can take all the what-ifs as they come. I love being a twin mom. LOVE IT! They may be MORE than double the work, but they come with so much love to go around. Don't worry about the work, your body knew you could handle this :) Now you've just got to convince yourself!