I moved all three of my kids to big beds before they were two. I found this transition really easy- I think it gets harder as they get older. Start out by having her nap in the bed. Then, if she seems to take to it then try the nightime thing. Once she can do it and likes it, then take the crib out asap so she won't regress.
Here's some issues to be aware of that take a little patience in the process (that, in my opinion are better the deal with now then when a new baby has entered her life and thrown her for a loop already). First, you need to have a rail to make sure she doesn't fall out. The best is to put the bed against a wall and have the rail on the other side. If have have a headboard and footboard, or maybe a daybed, still do the rail. Putting the mattress on the floor encourages too much getting out of bed, which brings me to my next issue.....
Your baby is going to realize at some point that she can get out of bed on her own. This may be immediate or may take months! I got lucky with my last one (will be two in December) that she didn't figure it out until the crib was a distant memory. This will be annoying to have the put her back in bed, or you may find her napping on the floor sometimes. I think this is okay! She will soon realize that her bed is so much more comfortable! This should not take more than a week or so! It's just a phase, like potty training, that takes patience and consistency. But, I really think that your daughter will be happier and feel like a big girl in her big bed.
In the end, it's really what your daughter is ready for! Give it a try, but don't push it. I have found the bed transition super easy for all three of mine (two of which I was pregnant as well), but it may not be so for every kid. Either way, it's not a big deal so do what's right for you and your family, not because of peer pressure from friends.