How old are they? Just let nature take its course. You can't make them breed. We have 4yr olds that even with their previous owner that have never bred (sp?). You'll probably find that even at 19C they may not breed, probably when it cools down more than that if you get a sudden cold spell. That's when ours did, our temp dropped then picked up.
What do you intend doing once you have the eggs, if they breed? How many do you intend keeping/raising? Do you have places that will buy them/take them? They take a lot of time - cleaning /feeding, making sure there's enough live food for twice daily feeding, daily waterchanges; separating them out into sizes as they grow and keeping well fed so it keeps down cannibilism; did I mention time! It also can work out quite expensive to find live food, if you don't have any easy food sources (ie daphnia or live baby brineshrimp)
Several weeks ago one of ours laid 250eggs, of those I've kept 20 (I have places all ready for them to go to in a few more weeks - otherwise I wouldn't have kept them); the rest I gave to a breeder who raises and sends axies round the country. These 20 larvae keep us on our toes, along with 10 adult axies, various other pets and young children.
Have you really thought about it before deciding to go ahead with it.