Feel like I should start DS2 (2y8m) with the old potty training lark but seem to have completely forgotten how to do it. DS1 was only trained about 18 monhts ago but I really can't remember how I did it! 
Started today and DS2 has done 3 wees on the carpet, a couple of wees and a poo in his nappy while we were out and refused (threw a wobbly) every time I suggested he sat on the potty or toilet.
Staying in the house for a few days is not an option as I have to take DS1 to and from nursery every morning but DS2 does have to be sorted out by September as that's when he starts nursery.
Should I leave it a while? Is he completely not ready? Any help gratefully received! 