Provide adequate ventilation, photo right. On a nice day, spray outside in your driveway or on the patio; the lacquer dries quickly enough that bugs and dust won't mar the finish.
Spray light coats to build the finish. Smooth, slightly wet coats reduce the need for between-coats sanding. If you do sand, let the finish dry an hour or so. (Follow the manufacturer's recommendations.) Wear a particulate mask when sanding.