A.J.
Here's how we did with our second at about 2 1/2 yrs old after dragging it out way too long with first.
Pick a weekend where you'll be home for a couple of days. Put him in REGULAR UNDERWEAR. Get a big cheap pack of UNDERWEAR. Pull ups will extend the process by months. Feed him lots to drink. Take him to the restroom every half hour or so. If he's on a little potty seat, teach him how to lean forward sitting so he doesn't spray out. Don't get discouraged when he has accidents or doesn't go. Just keep on keepin' on.
We didn't have trouble interrupting the training during days we couldn't do it. We just went back to it when we could. He caught on well. I know everyone says, NEVER scold, etc, but you do need to be a little firm when he gets it and just doesn't want to cooperate over time. Make him stay on the potty when you KNOW he has to poop for example after he's tricked you enough times and gone "right after" you let him up etc. The first time he actually does it, it takes away the fear. Remember, it comes in waves, so if he had to go (you saw him hiding and trying to go etc), and you swooped him to the bathroom he managed to "keep it in", guaranteed after a few more "waves" (a few minutes apart almost like contractions :) you can coach him to get it out if you don't let him up. But of course dont' make him sit too long either. Don't allow him to derail you with tantrums when he first doesn't like trying. Be calm, firm and patient. And don't forget the treats! We did M&Ms for pee and matchbox cars for poop.
There is a lot of bending over and trips to the potty for you, so don't beat yourself up if you wait until after your baby is born. Lots of ladies are pregnant during potty training age. Tough one! I waited a couple of extra months until my traveling husband was around to help.
Night time was not an issue. We had him pee before bed, and no drinks an hour before bed, and he never had accidents during the night. Not sure how long we kept a diaper on at night, but they were always dry in the morning. He's never gotten up during the night to pee, ever.