I'd probably drop one session at a time--probably do the bedtime one first and then get rid of the AM one, mainly because it will be easier on your body.
I dropped the bedtime nursing long before we stopped nursing in general. I just had DH put her to bed 90%+ of the time and that basically did the trick.
I also went back to work when she was 2.5 and left in the mornings before she woke up, so then she didn't nurse in the morning or during the day either. But she nursed when I got home from work for several months after that. But it was literally for about 30 seconds.
I thought she would never self wean, but then at 3.5 she magically did. But because I didn't feel like I "had" to nurse her all day, I did not feel like it was burdensome to continue nursing.
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)