Weddingbee boards

Hello everyone! HELP!

I need some serious advice before I pull my hair out. I'm 23 and my fiance and I are getting married at the end of October. I've chosen my two best friends as bridesmaids and felt obligated to also choose my two older (by ten years) sisters. The only one of those four that is actually being helpful is one of my friends, the matron of honor. The other friend only texts me or comes over so she can complain about her on/off bf. She gets bored when I turn the convo to me and try to talk about wedding stuff.

My two sisters are being completely uncooperative and I'm contemplating asking them to step down. I've been trying to get them both together to go try on bridesmaid dresses for around three months now but no one can give me a specific day that works. One of them doesn't even respond to my texts or calls (its been about a month of no contact.) I know this one has some jealousy issues because she's been with her boyfriend for over 7 years now, she wants to get married and he's stated several times that he's against marriage. I know how she is and I know she won't help with decorating the night before/day of either. I don't think her own issues should make her resent this special time in her younger sisters life.

My other sister is a stay at home mom, of a one year old (who has a housekeeper and gardener, so she has PLENTY of time on her hands) and refuses to come to our house to help me with decorations because we have two dogs and she thinks they're disgusting and she doesn't want them around her baby. With that being said, I'm a student of veterinary technology so my dogs are VERY well taken care of - not disgusting at all and both are very well behaved. We also don't have much money (whereas she and her husband do) because my fiance and I are both working-students and I get the feeling that she thinks we're 'beneath her level.' She also said she won't be able to attend the bachelorette party or arrive very early the day of for pictures because she doesn't want to leave her baby for that long and she won't be able to stay at the reception for more than an hour because of her baby also. Fyi, there is nothing medically wrong with her child, she's just hovering and thinks if she step away from her, the baby will spontaneously combust. She has a husband and a mother-in-law that would gladly watch her. When I asked her about considering a baby-sitter for the day of, she actually said to me "I'm not going to forget I have a daughter just for your special day"<--- what the hell, when did I ask her to do that?!

I'm getting beyond tired of holding everyone's hand and babying them to try and get them to try on/order their dresses or help me. I have a TON of decorations to make, not to mention I barely know anything about weddings and could really use some help. I'm especially hurt that my sisters aren't interested in being apart of this. 

Could someone PLEASE give me some advice?

Thanks for the advice, ladies!

Mrs. Wall2B, my sisters are both incredibly self-centered as well. I'm not asking much at all of them, just basic bridesmaid things and that seems to be like I'm asking them to rope the moon. Also, they too are trying to sabotoge things but they've been doing that my whole life so I shouldn't have expected anything different now. Just the thought of asking them to step down makes me day-dream about the stress that will melt away.

KH, I would love to ask my mother to do so but unfortuneatly she hasn't been involved either. She has her own issues and always thinks her problem are more important. My mother doesn't even know what my colors are or where the reception is... it's sad, really.  

I'm going to wait another two weeks to see if they start stepping up and if not, they are gone. I don't have many female friends but I'll gladly ask my best guy friend to be one of my 'maids'... something I hadn't even thought of until I saw it on the message boards today.