Monica, last summer when Sierra was 2, we just put in skirts most of the time and didn't have any underwear or diaper underneath. We made sure she could get to her potty whenever she needed it and she basically "potty trained" herself. If she had a diaper on, she would go in the diaper, wouldn't even tell us she had to go. No diaper, she would just go potty, or say she had to go.
It might work for you as well. Summer is the perfect time because of the relatively fewer clothing items required. I say don't wait until fall.