This way you can go over any and all safety precautions prior to having it installed. For example it is possible to get lifts to use a back up power generator so that in the case of a power failure of some sort, the elevator can still be used using the back up power.
Meanwhile by getting regular lift maintenance you can avoid break downs and other problems. Be sure to use your lift responsibly and not to fill it up above the recommended upper weight limit. Normally this will be written inside the elevator and might be in kilograms or a maximum number of passengers. This will normally be more than enough for your purposes, but if for example you need to take some furniture upstairs, then make sure you only have a few passengers on board. Likewise, of course don’t jump in the elevator and don’t force the doors. By taking these precautions you can then rest easy in the knowledge that statistically, more people have accidents on the stairs.