I'm having a similar problem. My DH is always here though, so he can put our toddler to sleep. My issue is more with where to actually put them when they are both asleep because my toddler is all about laying ON me. In my arms, up against me, smothering me sometimes, and I can't do that with a newborn in tow. Some nights I do put him to sleep. I think it might not be sooo bad because I can hold a baby and read to him and that works most of the time. WHen he gets tired of reading, he'll ask tolay down. Most of the time my DH puts him to sleep by wrapping him up and carrying him outside to walk or if its cold to rock in the rocking chair. My best advice is to not break something new out on your little one at the same time as a new baby comes. Keep talking to him about what is going to happen, how he will go to sleep, where the baby will sleep, what it will be like and start making suggestions to him about what will be coming (like: you will be getting to play in the dark quietly for a while before laying down, etc etc) I hear that THe No Cry Sleep Solution is wonderful though I have yet to read it. I don't think its a great idea to do something really new at the same time as the new baby though. Especially if whatever new is hard on the child already here, then they associate the two things and the last thing I'd want is my child to have any negative associations with the new baby. If you don't have a routine already, get started on one right away. I'm a huge fan of routines, though I will admit freely that the toddler I currently have is not so good with a bedtime routine. With my first though, it was most excellent
It's worth trying/incorporating though and it's not one of those things that will be vastly different because a baby is here. When my second was born, my first was 4.5, so telling you what worked with him isn't going to be much help for a 2.5 yr old but I willl say that talking to him A LOT beforehand did help. He understood that when the baby came, it might take Mama and Daddy a little longer to get to him, but we'd be there, and we went through with it. For his entire life I had laid down to sleep with him, all the way up until I went into labor in fact. The first night with new baby, I laid down with him (because 1 day olds sleep a lot) and told him that the next night I probably woudln't get to do that. That's exactly what happened. NOw Daddy lays down with him, and still does and if I can swing it, I still crawl in there with him
Sorry this got so long!