If you have not read my last piece on how to start a livebearer tank for breeding, well you should you can find it here
This is a list of the shortcuts you can take when breeding livebearers.
1. You don't have to cycle the tank for 4 weeks. If you dump enough Najas grass to cover half the tank, you will not need to wait 4 weeks for the bio filter to develop. Najas grass contains all the ingredients for a compleat bio filter.
2. With some fish such as Heterandria formosa or Tiger Limias, you do not need to separate the fry from the adults as well fed adults do not engage in cannibalism PLEASE RESEARCH THE FISH YOU ARE BREEDING TO MAKE SURE THIS IS SAFE.
3. If you live in a warm enough climate (100 + Fahrenheit) you may not need a heater as the water will be warm enough for some species (you might need to have some airflow on the tanks though).
4. If you have a good variety of plants in your tank you may not need to feed your fish at all as some fish (i.e. H. formosa) are perfectly content and happy eating nothing but plants. Other fish such as Gambusia affinis need a source of protein and this will not work.
Now for the list of shortcuts you can't take.
1. You need a sponge filter. A good old, air powered, archaic, sponge filter. While a power filter will clean your tank better, your tank may not be aerated well enough or worse, you will lose fry to the filter's grip.
2. You will need to dechlorinate your water. You CAN leave it chlorinated butt (and I use butt because this is a big butt)you will need to let your tank sit for AT LEAST 24 hours with nothing in it to let it gas off. Otherwise, just get a water conditioner.
3. Don't assume all livebearers are easy to keep. Some are easy and some are not. Just because you see a healthy looking molly in foggy, slimy water does not mean he is healthy. Be competent and don't assume. Just remember what happens when you assume and you'll be fine!
4. [I'll leave this open ended for some more points on both parts. If you come up with one, PM me and I'll add it!]