I sooo sympathize with you. Nursing while pregnant is no picnic. Once I hit the second trimester, the nipple pain turned into the heebee jeebees! I decided to nightwean my daughter when I was about halfway through my pregnancy to make room in my life for another nursling (I too was soo annoyed with breastfeeding that I was wondering if I'd ever be able to nurse my second...And don't worry. You won't feel this way with the new baby! Your mommy hormones will kick in...I promise!).
I night weaned by telling my dd1 that "'mama' (our word for nursing) is very tired and sore. (I didn't mention anything about baby to avoid any resentment. I also stay away from "big boy/big girl" language because I think it adds a feeling of guilt into the equation, but that's just me). That means that we will only be able to have mama for ten minutes . Then, when I count to three, mama will be all done for today. Then we get to snuggle." When there was a minute left, I gave a warning, "mama is almost all done." Then counted to three and made her unlatch. Whenever she would ask/cry/whine for nursing, I would let her know I knew what she wanted "mommy knows, (your childs name) wants mama, mommy knows" I did that for a week, each day lowering the time by one minute until we were down to five minutes. During this week, I nursed regularly during the night except that I would try to comfort her back to sleep for a short time (before she became upset before nursing her.)
The second week, I stayed with the five minutes and counting to sleep and during the middle of the night, I would let dd1 know when she woke to nurse "ok, but only for 3 minutes" I would give a one minute warning and then count to three and off she would pop and fall back asleep. After this was well established (it took a few days) I started lowering the time for middle of the night feeds until it got to "only for a quick bit" Ten seconds later, I counted to three....etc.
Finally I tackled those last five minutes of nursing before bed by lowering it to two. Then I would go to bed without mentioning nursing. When she would ask, I would say, "first lets say a prayer" or "tell a story" or whatever and then say ok, time for bed lets snuggle. This would work half the time and nursing those two minutes before bed slowly faded out of the picture.
That is my suggestion for gentle. It took me about a month and a half to nightwean my dd1.
Check out Dr. Jay Gordon's night weaning schcedule!!! He has a lot of good to say. That's all I can post for now... Sorry! Baby #2 just woke!!!