Patience. If there is a good lactation consultant in your area, contact her! if there are support groups for mothers of twins and triplets, also contact them. They can be invaluable! it is possible to nurse multiples...Pace yourself, ask for help, and if you have to supplement it is ok! be sure ou are eating and drinking enough to keep up supply and that you have down time. You rock!
Be flexible. Tandem breastfeeding takes some work- but has great benefits. Don't be rigid about a schedule, especially in the beginning, but try to feed the babies at the same- let the hungrier one dictate the schedule. Take care to perfect your positioning of the babies- there are twin nursing pillows available which can be helpful. Alternate breasts with each feeding and don't be afraid to ask for help.