The location in which you set-up your turbo trainer, albeit the garage, shed, or in the house, offers a more stable and controlled environment than the outside world. No wind, rain, roundabouts or traffic to contend with means that there’s no distractions or danger to prevent you from a quality workout.
Try to find a location with good ventilation, open windows to promote the flow of fresh air and use a fan to keep your body cool. Despite best intentions at some point it’s likely to turn into a sweat-fest so have a towel to hand and position your bike and turbo on a suitable mat. If you’re using a trainer that raises the rear wheel from the floor then balance this out by using a front wheel elevator block (or equivalent such as a book). Being able to watch something on the computer, television or having music on tap to get you in the rhythm can be a big help.