Ds1 was two a month ago. He's been using the potty on and off since feb for prompted wees. However, we haven't really bothered pushing it as weather has been shite and we've had builders in. He can wee whenever I ask him too, pretty much. And will do almost anything for a sticker! 
Ds2 is due at the end of July and I'll have ds1 at home 3 days a week from the beginning of the month.
Shall I aim (with the support of nursery) to try and crack it before ds2 comes?
Or am I completely off my rocker for considering it? Just worried that it'll be nigh on impossible to do once the baby arrives.