You have to be assure that the temperature in the room is not cold. You just need to put a fiew lamps just outsdide the terrarium, sit down on the floor, with a cover under your butt and your back on the sofa with a cushion, a cover over your legs and point the lamps to your legs. Then turn off the lamps inside the terrarium and open the terrarrium doors. Your tegu will come outside to search for heat and it wil find it lying on your legs. In this position the tegu will also feel the heat of your body and get used to your scent. Take a book, your mobile phone and a tv controller (low tv volume). You can stay in that position for hours and spent relaxing tamin time