Right now, today or even tomorrow is not a real term when talking about getting rid of a whole pack of rats from a certain property. First of all you have to study their presence there, not to just go and purchase 1kg of poison and spread it systematically accross everywhere. It might happen from time to time, but you have to be aware of the fact that for one reason or another this is the biggest mistake that a beginner can do: using too much poison than it might be actually necessary. Anway, If you guys want to really find out my personal opinion when it comes to rats I believe that one needs to think about prevention. This is the key. Not extermination, but prevention. Well, sometimes it might be too late to talk about prevention when you have like 20 or 50 rats somewhere in your basement. In that case you need to act fast and the biggest and most important moment you have to take into consideration is you either save time (which is much more important) or you go for saving a few bucks. When you strive to do it yourself you are going to be required to waste a lot of time on determining the real solution for your problem. You are going to need to test various techniques of getting rid of these rats and no one can tell you if these are going to work. That is why I really consider that this must start from a new era of understanding that you won’t be able to do the work much better than most of the professional rat exterminators do. You will understand this yourself sooner or later.
But meanwhile, figure out that in order to exterminate rats today you are going to need to just intoxicate the whole place with poison, and still, no one can guarantee you that they will approach that toxic substance and try to swallow it. After all, if they managed to find a constant food supply before say bye bye to their hunger.