I never ever had problems with sowing them inside,but it is true that they need a lot of heat and they cant stand cold,and yes you have to turn the tray every day.I have already nice tomatoes on the windowsill.They got there first real leaves and i have to put them in pots.On nice days when its warm enough,i suspect not before end of march,i put them outside in the shelter of the house.Every night the go into the greenhouse,till they are hardend enough to stay outside on the field.but then it is already may.