First, you have to accept that this is fate getting you back for a baby that slept through the night at 3 months, and being so adorable!
Anya is 2 now, and we starting going through the terrible twos at a little later stage than your daughter. Most books I’ve read say about 18 months is average, and Anya was earlier than that.
I would recommend getting some books. I like The Happiest Toddler on the Block, and 1, 2, 3 Magic, although I haven’t used the later yet since it really is for someone already two, but it gives some good ideas.
I treat diapers and clothes differently. I put diapers on Anya. She got used to the fact that daddy would have her lay down for changes where she wouldn’t do that with mommy. I’d sometimes have to do the leg over her body trick, and she would scream, but I got pretty good at getting it done quickly. I would also sing songs to her and make it a game at the same time, and really, really praise her anytime she would fuss less than normal. After a while, she would accept it and we were good.
The idea was that we were going to try to make it really fun, but if not, we were still going to get it done anyway.
Clothes are different, since your have some other tools available. You can give choices, even ones you wouldn’t have selected. Anya loved her rain boots, which she would wear anytime she could. So instead of struggling to get her to put on her shirt, as if she wanted a pink one or a white one.
When we were going through the no dressing stage, I would often ask her the color of my shirt or her mommy’s shirt and see if she wanted to have the same.
Giving a lot of choices during the day helps, I think, because then it doesn’t feel like you will is getting imposed constantly.
Remember that distraction is still your greatest friend at this stage. My friend who has a boy the same age as Anya would “punish” his son by giving a one minute time out starting about the age of your child, but we don’t think that it’s appropriate yet.
Building in routines helps. For example, have the diaper and clothes ready before you take the bath, so that you can quickly get her in them right afterward, and she may accept it more of the process of taking the bath.
I use natural consequences whenever possible. We let Anya watch about 15 minutes of kids DVDs now, and use that time to brush her teeth. When she fights it, then off goes the DVD. I don’t even have to say anything, just turn it off and she know that she needs open her mouth again.
I’ll write more later, but I’ve got to get her to bed now.
Good luck!