Close doors leading to the room the lizard is in. This prevents the lizard scampering off through the rest of the house. Open the windows. The lizard might find its own way out while you are trying to catch it. Approach the lizard slowly, not letting your shadow fall on it, and place the aquarium net over it quickly.n some places, small lizards such as geckoes regularly come inside and can be quite useful, because they eat nuisance insects such as mosquitoes. Not everybody wants a lizard in their living room though. If the lizard is not welcome, catch it and put it back into its natural habitat.